Various durometers and colors.
FYI, on durometers:
The hardness of rubber compounds is measured by the Shore A durometer; the higher the durometer, the harder the compound.
Typically 60% keyboards ship with an o-ring in the 55-60 range.
Featured Product: MechsOnDeck Keyboard of The Year Edition 2022 Calendar
All profits go to charity…and you get a calendar that has at least one of my photos. What more could you want?