1.EASY TO CLIP IN OUT: Doublesided design makes starting from stationary a lot easier, helping cyclists concentrate more on the road condition for r riding. The adjustable entry and release tension settings allow riders to find the sweet spot for clipping in and out. 2.OPTIONAL QFACTOR: Stance width is vital for a proper pedal stroke and overall bike fitting. Getting the right stance width for your body type and riding style not only helps improve stability and pedaling efficiency, but it can also help riders avoid injury. Normally, the shorter 52mm one is more suitable for small riders or people who is with toein(genu valgum). The longer 57mm one works better for rider with more external rotation at the hip and eversion of the foot and ankle (genu varum). 3.QUALITY MATERIAL: The body is constructed from CNCmachined 6061 aluminum alloy body, and the axle and bindings are made from top quality Chromiummolybdenum. 4 removable traction pins per side for improved grip and control. Size: 96 x 75 mm 3.8 x 3 inch. Weight: 429g/ pair. 4.SEALED BEARING 9/16' AXLE Fully sealed and LSL bushing bearing keeps spindle from water and dust, ensuring great durability and performance. 9/16' Axle is constructed from CNCmachined CrMo for exceptional smooth riding. Cleat: compatible with Shimano SPD type cleats SCS01 included.