Pedals body made of aluminum alloy, light weight, stable and strong, long service life.Bearing axis made of durable chromium-molybdenum steel,will not bend or break at any possible type of terrain. Pedals Body Size:106x100x15mm/4.17x3.94x0.59inch; Axis Diameter:12mm; The flat pedal design provides the best surface area for contact between your feet and the bike. Improve your riding experience and overall efficiency. Smooth and non-slip, it is more tolerant to dirt than ball bearings with no additional lubrication required. Grips the soles of the shoes firmly without doing any damage to shoes.with pins on each side of the platform will grip your shoes really and save your energy in the long riding. Able to assemble using wrench or hex key, "L" for left pedal, "R" for right pedal; 9/16'spindle suitable for most bikes,such as mountain bikes,road bikes,BMX and etc. Specification: Material: Aluminium Alloy Size Chart: Size: 106x100x15mm/4.17x3.94x0.59inch Package Includes: 1 Pair Bicycle Pedals Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!