[RUGGED DURABLE] The pedals are specially designed for spin bikes. Strong material: Ontology is made of high quality material, the surface is black electrophoresis, the screw is 22 steel, the strength is 8.8, the surface is nickel plated, the buckle bracket is spring steel, nickel plated, spring material 65MN[FULLY COMPATIBLE] Compatible with for Shimano SPD MTB pedals system, but not including road bike. Means you can use SPD cleats on these pedals or use these cleats on SPD pedals(not compatible with SPD-SL). Single direction release, release your cleats by twisting heels. Adjust the tension to a suitable position before use. Beginners should use it after repeated practice to avoid the danger of being unable to remove the cleats. Adjust the tension to a suitable position before use[ADJUSTABLE TENSION]: The cleats tension could be adjusted by the screw on the side of the pedal. It allows riders to achieve perfect clip in and out feelings. Note: this long spindle pedal spindle has an extra nut and is 10 mm longer than the normal pedal spindle. Weight: 765g=1.68lbs/pair. package included a spare pedal straps and a wrench[LARGE PLATFORM] It ensures more riding stability.[3 FUNCTION] SPD system - pedals with straps and clips - Ordinary flat pedal, suitable for Spin Bike, Indoor Exercise Bikes and All Indoor BikeType: Short axle 1/2 inchcolour:BlackMaterial:Aluminum alloy+PPsize:17 x 6 x 7cmPackage Contents:1 pair x SPD PedalsOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.