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The Feramox Invisible Ring Size Adjuster is a transparent, flexible TPU accessory designed to fit thin rings (1-4mm width) and reduce their size by 0.5 to 2 sizes. It offers a comfortable, skin-safe solution to prevent loose rings from slipping, featuring four adjustable sizes in one pack and an easy-to-use design that remains virtually invisible on your finger.





| ASIN | B07WK2NNR6 |
| Best Sellers Rank | #74,439 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #33 in Ring Sizers |
| Brand | Feramox |
| Brand Name | Feramox |
| Color | Transparent |
| Customer Reviews | 4.0 out of 5 stars 8,093 Reviews |
| Finish Type | Unfinished |
| Item Weight | 0.49 Ounces |
| Manufacturer | Freeman direct |
| Manufacturer Part Number | FM01-JA-9 |
| Material | TPU Silicone |
| Material Type | TPU Silicone |
| Model Number | FM01-JA-9 |
| Number of Pieces | 8 |
| Product Style | Modern |
| Style | Modern |
| UPC | 729270436141 |
| Unit Count | 8.0 Count |
C**Y
Work perfectly!!!
I ordered these to adjust the size of a family heirloom ring. The ring has an engraving inside the band so it's impossible to have it resized without ruining the inscription. Also, since it's a family heirloom and will be passed on in due time, I didn't want to do anything to permanently alter the ring. These size adjusters solved all my problems. They were affordable and included a variety of sizes (I wasn't sure what size I needed) so I have additional ones I can use on other rings. The ring fits me perfectly now and, since the size adjusters are clear, I can still read the inscription and it is almost impossible to tell there's a size adjuster on the ring. If I had to come up with something negative to say I guess that the size adjusters were a bit difficult to get on the ring. However, I don't really see this as a drawback since it makes me feel that the ring is more secure.
R**L
Comfortable, invisible spacer that actually works.
I was able to get a perfect fit with this product! I just received an engagement ring (YAY!), and despite ordering a custom size (my fingers are pretty small, size 4.5) it was still a little loose. I find the coil spacers uncomfortable and my ring spun on my finger which affected the look and comfort of my ring. That led me to this great product! The kit comes with 8 spacers (2 of each size) and I was able to find one to fit my thin band. Make sure to try all the sizes to ensure you're getting the best fit. I also like that this spacer snaps onto the inside of the band so it doesn't cover the diamonds along the side of my ring. If you have issues with the spacer falling off or need a slightly tighter fit, the kit also comes with this rubbery, double-side tape that you stick inside the groove of your spacer. The tape can be tricky to get into the groove of the thinner spacers, but is easy to remove or adjust, and doesn't permanently adhere to your ring. I didn't find that the spacer fell off on it's own ,but I added the tape anyway to make it a little more snug. Overall, I definitely recommend giving this a try. It's comfortable to wear and not clunky like other spacers. Fairly easy to use, and once you have it on, you'll forget it's even there.
J**T
Works well, but not as well as getting your ring resized
It works well. Sizes down almost a full size. it does move around slightly on the ring. Nice to have on hand, but overall if you just have one ring that's too big, you might as well just get it professionally resized. It costs less than fifty dollars to downsize a ring generally, so if its a ring you wear everyday like a wedding or engagement ring its more worth it to get it resized than to wear this everyday.
R**S
not tight enough
The product is not tight enough and the band still slips. It was very hard to get on the ring and the clear tape that comes with it does not work at all with the product.
I**O
Comfortable and convenient
The smallest size fit my ring perfectly. I would say my ring is about a whole size bigger than my original ring size and this keeps it in there perfectly without it turning or falling off my hand when I wear it. Also you can’t even tell that it’s there it’s super comfortable and doesn’t bother me while wearing it.
D**D
hard to fit
almost impossible to fit on ring. had to use pliers to get it on the ring
W**N
Genuinely amazed at how well this worked!
I recently got engaged and had my ring resized once already, but I was hesitant to have it sized down just a little more. My ring was just large enough to rotate when I type and with typing being a main aspect of my job I looked up some solutions. I was split between this and the spiral corded one and I am so glad I chose this! The sizes this kit comes with are great and I was able to find one that fit comfortably on my super thin band. It was easy to pop on/off (not so much if you have acrylic/fake nails), and I ended up not needing the adhesive it comes with. It does come with a MASSIVE sheet of adhesive in retrospect to how much you'll need to attach them to a ring (just bigger than a business card) so I'm trying to find other uses for it so it doesn't go to waste. When you have a size you're happy with it's easy to pop off and trim if necessary, and on my finger (size 7.5) it's not noticeable in the slightest. TLDR: Get this over the corded ones, it's way more comfortable and less (if not at all) noticeable. Great size options. Even comes with a sheet of adhesive tape for extra security. Worth the money 110%.
C**R
Amazing!
Love this! I have bought other ring sizers before but this is by far the best in the market! It’s so discreet!! It fits on the inside of the band and clasps around the band. It’s very comfortable and you cannot feel it or notice it. Great product!
T**R
Waste of money
They are a waste of money! I would not recommend them
J**D
Perfect Solution!
These little ring size adjusters work very well. Choose a size closest to the band of the ring and it will stay in place. The adjusters take up the extra space and stop the ring from twirling around. I've lost a few adjusters over time, in sudsy water or just out and about, so I order more. There are different widths in one package to use with different ring sizes. Very easy, they don't show as they are clear and stay on the inside of your hand so work perfectly. If I hadn't found these, I would have stopped wearing all my rings by now as they would all be too loose after I get them over my knuckles.
K**M
Great - from size 7 to 6 and invisible.
Works perfectly. My wife was a size 6, the ring I got her was size 7, it was able to save her a whole size. Some of the bigger options were even too tight. Was great. If the ring is too big really just get this and save yourself from spending a lot of money to ruin the ring. It is invisible.
L**L
Easy, Comfortable, and Perfect!
These worked perfectly for my ring which was slightly too loose and keeps it upright on my finger! I don't feel it when it's on and can't tell that it's there until I remove it. Love that they're easy to take on and off and comes with an extra adhesive adjuster if I needed the extra boost. Price is very reasonable and having a little silver polishing cloth included is a useful bonus!
J**.
HARD PLASTIC -
these are HARD plastic, not flexible like I wanted - didn't work for me at all, does not fit any of my rings??
Trustpilot
2 months ago
1 month ago