Kool Stop Avid SRam X0 Trail Disc Brake Pads (Organic Compound, Steel Backing) Kool-stop disc pads are made with Organic materials that are Blended and bound together using a resin The compounds do include small amounts of metal to improve the braking Formula but though this is a mined material the pads are largely Organic Kool Stop, disc pads Organic compound, disc brake pads, shape: Avid xo-trail, Organic, pair