Power Grips MTB Pedal Set has a Diagonally positioned strap that utilizes dynamic tension to hold your foot in place. Made of a "crush proof" elastomeric polymer laminate, the 11 4" strap opens up without a toe clip. A natural foot rotation from side to side adjusts the strap for comfort and power. To release, roll your heel outward and back. Easy one key adjustment. Features: Get more out of your pedal stroke with Power Grips Lightweight, durable design installs easily to your pedals Fits shoe circumference up to around 13" (usually around a size 12 max) Strap can be adjusted with a phillips screwdriver and 8mm Allen wrench Specifications: Platform Dimensions: - Platform Material: Resin w/ Steel Cage Spindle Size: 9/16" (Standard) Spindle Material: Chromoly Steel Bearings: Ball & Cone Traction Pins: - Color: Black Weight: 500g (Pair)