Pentel Clic Retractable Erasers 3/Pkg, Multi-Colour, 1.63 x 7.32 x 18.42 cm

The reviews mention only erasers. Seems like the seller changed the product from eraser to eraser pens. Can someone tell me if the pens work well?

I just brought this item, and the clic so loose it push back each time I try to erase. How can I fix it?

Made in china?

What is the diameter of the eraser itself? (Not the plastic pen/holder)