Kool Stop - Disc Brake PadsCompatibility:Magura:MartaMarta SL -- 2008 Weight: ca. 15 gr/pairDisc Brake Pad TypesRed Back: 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. The term semi metallic can also be used. We have found during testing that our disc pads are Rotor Friendly and provide high performance braking throughout the life of the pad.Aluminum Back (Organic Brake Compound): Kool-Stop disc pads using the aluminium back plates are made with the same organic compound. The weight per pair is around 10 grams.Copper Plated Back (Sintered Brake Compound): Kool-Stop sintered metal disc brake pads are designed to give your bike performance braking in extreme conditions, e.g. XC, downhill, trials and dual slalom riding. Our pads have a quick break-in period so you get maximum performance during those demanding rides when stopping power, durability and long pad life are required.