ACID DISC BRAKE PAD SHIMANO DEORE BR-M505/15/525/445/446 ORGANISCHAbrasive substances used for 'organic' brake pads are usually made from fibres obtained from glass, rubber, carbon Kevlar or Twaron combined with fillers and temperature resistant synthetic or natural resin. These brake pads have a reputation for being softer and quieter, but they also have a reputation for being fast wearing and creating more brake dust. They also tend to rub more after exposure to high temperatures. Designed for amateur and beginner