This is a kind of fine quality bike shifter, made from aluminum alloy, durable. 3 speed left brake lever, 7 speed right brake lever, precise gear changes. Wide transparent dial makes it easy to see which speeds you're in. 

• Compatible with both  shifting and braking function, easy operation
• 3 speed left brake lever, 7 speed right brake lever, totally 21 speed for optional
• Made from aluminum alloy + plastic, hard and thick, resistant to collision and not easily deformed
• Wide transparent dial allow you to read the speed more direct and clear
• Ergonomic knob and energy saving pulling bar make shifting gear easier and quicker
• Simple to install and suit different types of bicycles

Specifications:

• Material: Aluminum Alloy + Plastic
• Product Size: 16.5 * 8 cm / 6.5 * 3.1 in
• Unit Weight: 172 g / 6.1 oz