Product Description Sram MTB ceramic bearing jockey wheels fits with Sram X.0 2008 and XX. It features: ceramic balls/stainless steel races, road-compatible with Sram red, force, and rival rear derailleurs, weight 24 gram per pair. It also reduce friction, increase stiffness, decrease weight, and add durability. Grease is optimized for low friction and maximum longevity. It comes with 10 mm syringe. Manufacturer’s Description Area: Cross Country / All Mountain / Freeride and DownhillSmoothly running and durable pulleys Colour: BlackTeeth: 11 Box Contains 1x Pair of Jockey Wheels