Lightweight Polyamide Black Bike Pedals For BMX Road MTB Bicycle Size: 4" x 4" x 1", Axle: 9/16" - comes in pair Material: Made of high quality polyamide, good abrasion resistance and corrosion resistant performance. Bearing structure, pedaling extremely smooth. Advantage: Antiskid nail surface, strong grasps, no longer skid. Big platform shape for long ride comfort. Installation: The pedal axis screw distinguish left and right, "R" "L" mark the direction of right and left. We suggest to use 15mm professional open end wrench to install the pedals. Suitable for: BMX, cruisers bicycle, kids' bikes, road bicycles, MTB bicycle, mountain bicycles, junior bicycle, city bicycle, etc.