Feature: 1. Lightweight Design: Plastic steel body, lightweight material, high strength, durability and impact resistance. Ergonomic lever design, easy to shift gears, gear shifting feels good, and gear shifting quickly and simply. 2. Clear Gear Display: The digital gear display is clear, the shifting is clear at a glance, the transparent window design, the shifting pointer is clearly displayed. 3. Smooth Shifting: Galvanized shift inner cable, original matching, smooth shifting, rustproof, standard shifting performance, high roundness grinding core, tail end welding technology. 4. Gear Shift Lever: The shift lever has a moderate concave point and is convenient for finger jam. The gear shift lever has a large contact area and the fingers are easy to exert force. 5. Universal Installation Diameter: Alloy hex socket screws, standard universal 22.2MM diameter, with alloy screws, high versatility and good stability. 6. 3x7/21 Speed Dedicated: Left 3 speed front shift lever right 7 speed rear shift lever, good compatibility, suitable for multiple brand models. Specification: Item Type: Mountain Bike Shifter Material: Plastic Steel Main Material + Galvanized Shift Cable Commodity Size: Left 3 Speed Front Shift Lever Length: Approx.179cm / 70.5in Right 7 Speed Rear Shift Lever Length: Approx. 205cm / 80.7inSpeed: 3x7 21 Speed Dedicated (Left 3 Speed Front Shift Lever + Right 7 Speed Rear Shift Lever) Gear Position: Transparent Window Digital Gear Position Installation Method: Direct Mounted Shifter Color: As Pictures Shown Weight: Approx. 287g / 10.1oz. Package List: 1 x Left 3 Speed Front Shift Lever1 x Right 7 Speed Rear Shift Lever Note: Please allow 1‑3mm error due to manual measurement. Thanks for your understanding.