DFS Backing Pad soft - compatible with Festool RO150 - for sanding discs Ø 6" 150mm - Backup Pad with 15 holes for dust extraction - soft medium or hard available :
Justech Sanding Disc Medium-Hard Sanding Discs 150 mm Compatible with Festool Festo Random Orbit Sander ETS WTS LEX LET Backup Pad with 17-Hole for Standard to Rough Grinding Work : Amazon.co.uk: DIY
Festool Random Orbital Sander Backing Pad Hard Version 150mm - Screwfix
Festool 499097 STF D125/90 P120 RU2/50 Sanding Discs for RO 125/ETS 125 (Pack of 50) : Amazon.co.uk: DIY & Tools