White Industries MI6 Disc Disc Brake Cassette Hub, Silver Polish, Shimano-compatible, 135 mm 32H Oversized 15mm chromoly steel axle to withstand the rigors of mountain biking 32H, 135mm, 306 grams Light and strong precision machined freehub body Shell is machined out of 6061-T6 aluminum with for lightweight performance and durability Genuine White Industries part, made in the USA