What's in the box:

Bicycle Chain Guide MTB Mountain Bike Single Disc Chain Guard Protector (Standard)

Features:
Made of aluminum alloy, CNC machining, high-strength and lightweight.
Suitable for 31.8mm - 35mm seatpost diameter / E type mount.
Easy to install, safely keep your chain from dropping.

Specifications:
Material: Aluminum alloy + Plastic
Compaitibility: 31.8 - 35mm seatpost
Dimension: Approx. 71 * 68 * 65mm / 2.8 * 2.7 * 2.6in
Weight: Approx. 53g / 1.9oz

Package List:
1 * Chain Guide