Built from a Polyamide Nylon with co-molded Teflon toe and heel inserts, the Look Cycle Delta Road Cleat lasts longer than the previous generation of Look cleats. They engage and disengage with substantially less friction, and they're a whole lot quieter as we pedal. If you have the Keo pedal system, you must purchase the Keo-specific cleats. If you have any other style of Look pedal--any model, any year--you need to choose the Delta cleat. Keo cleats are NOT compatible with any Look pedal system except the Keo. The Delta cleat is compatible with all Look pedal systems except the Keo.