The rubber part of this palm rest is fixed to a powder-coated steel plate that connects to the UHK. We use EPDM rubber of Shore 60 hardness. It has a slightly grainy surface and a decent grip. Internally, the rubber has a cell structure that remains firm under pressure.
The palm rest firmly attaches to your UHK, and it's strongly recommended for maximum ergonomics. You can simply pull this palm rest apart from the UHK to unmount it and mount it in the opposite direction.
This palm rest is compatible with UHK 60 v1 and UHK 60 v2. As for feet compatibility, it's not compatible with UHK 60 v1 Feet, only with UHK 60 v2 Feet.