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.

Rubberized grip pads keep hard drives from sliding. Adhesive is strong enough to hold up on most surfaces.

Anti skid/slip rubber sheet is excellent. Can be cut into any shape desired. Had a little harder time than anticipated cutting a nice circle using scissors.

Product is not as advertised. The pads are useless. They are now in my junk drawer gathering dust. The one pro is that it’s very easy to use and customize.