Review on Silicone Rings Gasket Compressor 4X1X1 5Mm by Original Mansel

These are by far the best o-rings you can get for mechanical keycaps. Not only are they slightly more comfortable than the o-rings commonly sold for this purpose, they are real o-rings (not a new imitation). They actually keep it from falling off, unlike the o-rings commonly sold for keyboards. You need a 9x5x2mm o-ring. You will need 4 packs (30 per pack) for a standard 104 key keyboard, but you will need 5 packs if you have a 108 key keyboard. If you're thinking of 1 o-ring per 1 cap, this math doesn't make sense. But as you may know, most of your longer keys (shift, enter, space, backspace, etc.) require 3 o-rings each. I will definitely buy more if the need arises. For mechanical keyboards, I can't recommend them enough!