This 103-hole, 150mm diameter intermediate pad from Bosch will fit a whole host of 150mm random orbit and dual action sanders.
It is 1mm thick with hook and loop attachment, and simply fits between your sander and chosen abrasive disc. The pad greatly extends the life of the backing pad on your sander. The multi-hole configuration allows its use on many different makes of sander.
The pad minimises wear of the sanding pad; simply peel off and discard when it eventually wears out. The pad comes as a pack of 2, so you will immediately have a spare to hand.