These discs are perfect. They are harder than rubber or silicone so they don't squish down.
These are not 320mm in diameter. If you read the small print it says that but the title says 320mm. Better read all the fine print.
The glue holds the pieces to the wood and the ruber keeps the block fro sliding. There's no fight to peel off the adhesive covering.
I searched up non-slip grip pads, and found these sheets of rubberized grip. I have a keypad peripheral for my computer that slides all over. These pads are perfect.
The rubber furniture pads are very easy to cut, into pieces to the sizes you need. Can be cut into any shape desired.
Product is not as advertised. The pads are slick and the foot switch moves around just as easily as it did before i put them on. For my purposes the pads are useless.