Review on Enhance Typing Experience: Rosewill Mechanical Keyboard Rubber O-Rings, 120 pcs - RO-100T, O Ring by Percy Haulin

Due to the low profile design of Cherry MX Speed Switches, the o-rings don't do anything for them because the o-rings (under attached to the keycaps) never come into contact with the switch body. Even when the switch is fully depressed, there remains such a large gap between the bottom of the keycap and the switch body that the O-ring cannot travel that distance even when half-folded. The keycaps are inside the switches, not on the switch bodies. They worked on my K68 with standard height Cherry MX Red switches because the switches have raised housings that actually make contact with the O-rings. Edit: They work with some of the buttons on the K70 MK.2 Rapidfire. The keycaps of this keyboard have different heights. With taller caps, the gap is too big and the o-rings can't touch. On shorter caps they work as advertised. But I ended up not using them because I wanted my keyboard to sound the same.