GREAT FOR INDOOR BIKES: These pedals are specially designed for indoor bikes. Durable material: dia-cast aluminium body, extra heavy-duty oversized CNC Cr-Mo 9/16" Axle; Smooth-riding: sealed bearings. Friendly reminder: Please do NOT use other pedals, such as road or MTB pedals on indoor bikes. DUAL FUNCTIONS: Riding with Look Delta road cleats style shoes or for Shimano SPD MTB type shoes. This pair of pedals is great to replace those indoor bike pedals that are only compatible with the Look Delta system. Compatible with Peloton Bike, Look Delta (1 set of 9 degrees) & for Shimano SPD (1 set) cleats, which are all included in the package.