What do the numbers 6X12, 10X17, 5X11, etc mean?

The numbers represent the size of the case (the outside) of the capacitor in millimeters, i.e. 6X12 means 6mm wide X 12mm tall, 10 X 17 means 10mm wide X 17 mm tall.

How good are these capacitors? Asking anyone who has used them in components or a while (over 6 months)? I see some reviews mention leaking or bulging

I have not had any problems with leakage. Values have been accurate, i precheck every component before i install it. I’m not sure why a capacitor would be bulging, perhaps others are using incorrect values?

What if one explodes? I had a 470 microfarad 16V capacitor explode about 8 inches from my face, so I got a shrapnel wound just above my eyebrow.

Electrolytic capacitors can explode for two main reasons: reverse polarity and over-voltage. Your design should have a voltage safety margin (e.g., 50% above Vpeak) and especially prevent any reverse voltage. Higher voltage or higher capacitance requires a larger physical size, but don't try to use too low a rating to keep your project small.

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WIDE CAPACITANCE RANGE - From 0.1uF to 2200uF, perfect for every project scale.
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This EEEEE capacitor assortment kit includes 304 electrolytic capacitors spanning 20 capacitance values from 0.1uF to 2200uF, all neatly organized in an individual box lid. Designed for industrial electrical applications and Arduino projects, it offers a versatile, reliable solution for professionals and hobbyists alike.

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