Features 1、Quick installation and removal, specifications include 3x7speed, 3x8speed, 3x9speed. 2、Dial 3 speed with your left hand, dial 7/8/9 speed with your right hand. 3、Its quality is stable, perfectly compatible with for speed control system. 4、Cost performance is quite outstanding, it is a good choice for car friends who pursue high cost performance. 5、Made of firm metal, lightweight and integrated design, easy to control. Specification Features: Quick installation and removal, specifications include 3x7speed, 3x8speed, 3x9speed. Dial 3 speed with your left hand, dial 7/8/9 speed with your right hand. Its quality is stable, perfectly compatible with for speed control system. Cost performance is quite outstanding, it is a good choice for car friends who pursue high cost performance. Made of firm metal, lightweight and integrated design, easy to control. Specification: Condition: Brand New Material: Metal Color: Black Options: 3x7Speed, 3*8Speed, 3*9Speed Size: Approx. 11.5 * 8 * 5.5 cm / 4.5 * 3.1 * 2.2 in Weight: Approx. 315g Package List: 1 * Pair of Bike Derailleurs Package List