Quick release adapter easy to install or remove the pedals, aluminum alloy frame and cro-moly axle for great durability and long time lasting, this quick release pedal will provide you a pleasant cycling experience~ Feature: Quick-release pedals compatible with MKS and easy to remove from the crankarm without tool. Aluminum alloy body with cro-moly axle for great durability and long time lasting. Universal 9/16 inch screw thread spindle fit for most folding bike, MTB bike and road bike. Sealed bearing and DU structure for smooth rotating. Side reflective stripe improve safety in dark. Specification: Material: Aluminum alloy Axle: 9/16 inch Size: 8.7* 8 * 2cm / 3.4 * 3.1 * 0.7in Unit weight: 151g / 5.3oz Package weight: 433g / 15.2oz Package List 1 * Pair of QR Pedals