Features： 1、Plastic Steel Main Body: Plastic steel main body, lightweight material, high strength, durable and impact resistance, strong compatibility, smooth speed change. 2、Clear Digital Display: Clear digital gear and speed pointer display, speed at a glance, transparent window design, smooth speed, beautiful and generous. 3、Galvanized Variable Speed Inside Line: Galvanized variable speed inside line, original set, rust proof variable speed, standard variable speed performance, high roundness grinding line core, end spot welding technology. 27 speed dedicated, left 3 speed front variable speed dial, right 9 speed back variable speed dial, good compatibility, suitable for many brands of models. 4、Ergonomic Lever Design: Easy to shift, ergonomic lever design, ergonomic design, good hand feeling for shifting gears, fast speed. The concave point is moderate, and the finger position is convenient. Shift gear lever, large contact area, good finger force. 5、Fine Adjustment Speed Change Knob: Fine adjustment speed change knob, brake close bite, fast adjustment speed change strength, brake texture close bite, not easy to slip and more durable. Universal mounting caliber, alloy hex socket screws, standard universal 22.2mm / 0.9in caliber, equipped with alloy screws, high versatility, good stability. Specification： Item Type: Mountain Bike Derailleur Weight: Approx.280g / 9.9oz Material: Plastic Steel + Galvanized Variable Speed Wire Product Size: Left 3 Front Variable Speed Line Length: Approx.178cm / 70.1in Right 9 Rear Variable Speed Line Length: Approx.205cm / 80.7in Speed: 3x9 27 Speed Dedicated (Left 3 Speed Front Variable Speed Dial + Right 9 Speed Back Variable Speed Dial) Gear: Transparent Window Digital Gear Installation: Straight Mounted Dial Caliber: Approx.22mm / 0.9in Package List： 1 x Left 3 Speed Front Variable Speed Derailleur 1 x Right 9 Speed Rear Variable Speed Derailleur