The support with cooling fins prevents heat buildup by reducing thesurface temperature of the pad by at least 50C. Organic compound. Compatible pads with: SHIMANO XTR M975, M966, M965; Saint M800; Deore XT M776, M775, M765; SLX M665; Deore LX T665, M585; Hone M601; Deore M596, M595, M535; Alfine S501, S500