Patented, oversized double-tip 6-pawl + cam-plate mechanism for 12-points of drive engagement 6-points for light, quiet coasting. 1-piece forged/machined aluminum shell with large diameter 17mm aluminum axle. Quad-bearing, stainless steel sealed cartridge #6803 that features adjustability and a patented sleeve technology for ease of adjustment and improved bearing life. Shimano/SRAM style aluminum cassette bodies equipped with 3 steel faced splines so the cassette will not damage the aluminum. CrMo quick release skewer included.