We offer you a high-quality tension gear crank. A new product, without defects. We guarantee our customers 100% quality of purchased products. Tension gear crank. Double-sided crank, with a 10x10 cube on one side and a 14x14 cube on the other. This makes it easier to adjust the tension and if you replace the gear, you don't have to worry about the size, because these are the 2 most commonly used sizes.