21'new model, It is made of 17mm in diameter alloy 7075 high strength axle，with hight end TPI 2+4 pcs sealed-bearing from Taiwan, ultra-high strength and very smooth, always high quality and good price! multi specification: 32holes, 15x110mm front,10x141/12x148mm rear, and shimano 11s,shimano Micro spline 12S,sram XD 12S freehub available. Direct supply source of our own brand,best-selling worldwide， Please Note: 1. Conversion endcpas adapter do not include. You can find them on our store. 2. The quick release hub include a skewer while the thru axle hub does not include. Because the thru axle skewer needs to be determined by the thread specification of your frame. 3. In the option, "HG" refers to the freehub of the rear hub suitable for Shimano 8-11 speed and &Sram 8-10 speed and PG series 12-speed MTB cassettes, "XD" refers to the freehub of the rear hub suitable for Sram 11-speed/12-speed cassettes, "MS" refers to the freehub of the rear hub suitable for Shimano Micro spline 12-speed MTB cassettes.