Description: New high quality, durable and long-lasting performance. Ceramic ball bearings' performances are very good, especially in the low load and high-speed environment. Widely used in industrial, cycling, sports and other industries and equipment above spare parts. Fits most bikes: mountain bike, city bike, folding bike. Specification: Material: Bearing Steel + Ceramic Ball Size Specifications: 9x17x5mm/ 0.35x0.67x0.20inch Weight: 3.3 grams Package Includes: 1 Piece of Bike Rear Guide Wheel Bearing
