Onedayshop&Acirc; 1 Pair Butterfly Design Aluminium Alloy Sealed Bearing Mountain Bike Folding Bicycle Cycling Pedals (Purple) ANTI-SKID NAILS - Double-sided Non-slip platform, 12 pcs hexagon head bolts provide more friction and more adhesion, make the bicycle pedal more solid and reliable, reduce the foot skidding, make cycling safer.eight STRONG MATERIAL - High-strength aluminum alloy material provides the bike pedals more durability, surface treatment process of metal oxidation enhances the abrasion resistance, greatly reducing scratches and protects the original color of bicycle pedals effectively. BEARINGS - Standard 9/16 inch steel spindle sealed bearing which prevents water and dust from entering the shaft, protects the interior of the bearing and sealed bearing prolongs the lifetime of the bicycle pedal. ULTRA WIDE - The bike pedal size is 3.4 x 0.7 x 3.2 inches, more fitted to the kids bikes, the area-wide bicycle pedals provide a more comfortable ride experience and make the riding safer. EASY to INSTALL - L for left pedal, R for right pedal, screw thread is 9/16", suitable for most mountain bikes, road bikes, BMX bikes, folding bikes, urban bikes, travel bikes, cyclo-cross bikes, fixed gear bikes, unicycles, scooters, e-bike etc.