Brand : MKID Material : Silicone Rubber Color : Transparent Quantity : 20pcs Hardness : 50A Outer Diameter : 0.118 inch (⇔ 3mm) Inner Diameter : 0.039 inch (⇔ 1mm) Thickness : 0.039 inch (⇔ 1mm) These round O-Ring seals are made of high quality silicone which is high temperature resistance, non-toxic and no smell. This O-Ring gasket should work on any tray mount keyboard if it has a similar screw size. This modification is popular among mechanical keyboard owners from around the world. Since this O-Ring mod help the tray mount keyboard sound much better, it also improves the overall typing feel as well, making the keyboard feel much more even, softer and #34;poppy, #34; thanks to the soft silicone rings the PCB/Plate sits on. Note : * Due to the light and screen difference, the item #39;s color may be slightly different from the pictures.