RACEWORK Ultra-light Floating Six-pin Bicycle Disc Brake Pads, Spec: 180mm1. Copper brake surface, carbon fiber bracket, laser etched rivets 2. Simple installation and convenient operation 3. Material: carbon fiber + high carbon steel 4. Surface treatment: anodizing process 5. Universal for mountain bike road bike disc brakes 6. Specifications: 140 160 180mm 7. Weight: about 78g, about 91g, about 111g 8. This product is manually measured, and there may be errors of 0. 1 0. 2 mm and 0. 1 0. 2 grams in length and weight;