This is ultra-high quality G240 Velcro Random Orbits This fits all brands of 150 mm random orbit sander including Bosch, Black & Decker, AEG, Atlas Copco, Dewalt, Elu, Festo, Hitachi, Kress, Makita, Metabo and Skil Back pads and Velcro-type fastening system Resin-bonded aluminum oxide for long life and fast material removal