Shimano Shimano B01S Resin Disc Brake Pad and Spring, 4th version of B01S pad, fits many Deore, Alivio and Acera Calipers - Philbrick's Ski, Board, & Bike
SHIMANO M05 RX DISC BRAKE PAD SET (REPLACES B01S & B03S PADS) – Ultimate Sports
Shimano B01S Resin Disc Brake Pads - Blue Sky Cycling