High-quality materialsthis crank arm is made of high-quality materials, which is sturdy and durable. High strength, high hardness, not easy to deform. Comply with strict quality control standards, reliable in use High-quality materialsthis crank arm is made of high-quality materials, which is sturdy and durable. High strength, high hardness, not easy to deform. Comply with strict quality control standards, reliable in use Fine workmanshipsample design, fine workmanship, used for the installation of bicycle mid-drive motors. Size: about 21*3.8cm/6.3*5.9inch; weight: about. 450g Easy to installour crank arms are light in weight, small in size, and easy to install and use. Our products have been tested to ensure trouble-free installation and performance, please rest assured to buy Applicableour crank arm is suitable for BMX Bike, BMX Bike-Old School, Cruiser, Cyclocross Bike, Electric Bike, Folding Bike, Hybrid/Comfort Bike, Mountain Bike Specification: Item Type: Crank Arms Material: Blend Material Color: Black Size: Approx. 21 X 3.8cm / 6.3 X 5.9inch Weight: Approx. 450g Package List: 2 X Crank Arms