HIGH QUALITY MATERIAL - resin and alloy Construction: For bike pedals with clips and straps, we use durable engineering resin and alloy which are considered for safe prblems.1 extra pedal strap as a gift. PEDAL SPECIFICATIONS - Our pedals are 9/16 inch spindle. It is suitable for all 9/16 spindle bikes, including indoor exercise bikes and spinning bikes, as well as outdoor bikes. Pedal size: 9.5 cm long, 6.4 cm wide, clip size: 13 cm long. SAFE USE - Aluminum Alloy Body and Sturdy Resin Cage.If you choose to put your foot in the non-cage side of the pedal, you run the risk of the cage hitting the ground, So you must be familiar with the pedals before use to ensure safety. EXCELLENT CONTROL - Good metal grips on the bottom and nylon type straps on the top will keep your feet positioned just right on the pedals. With bike pedals, you can have an excellent control while pedaling your bike.