- Made of premium aluminum alloy material for durable and use. -- It works fine, shifts fine, looks good on the bike. -- No problems with installation. -- Perfect gear range for your intended. -- Warm Tip: Dear buyer, Due to lighting effect, monitors brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand Thank you Description Bicycle Crankset 32 Teeth Bike Crank Arm Set, 170mm Square Taper Mountain Bike Crankset Single Conversion Kit for MTB BMX Road Bicycle Accessories Feature - Color: Silver - Material: Aluminum Alloy - Size: 17x12x1. 5cm - Handle length: 170mm Package Including 1 x Crank set