Is it difficult to change the speed of ? Do you feel that it's hard to ride your bike? It is to change the . Our is easy to install and fine workmanship. You won't be disappointed.

Features:
The surface is waterproofing.
Compatible with or long cage derailleur.
Suitable for highway or mountains.
The shape of cogs are specially designed for shifting performances.
Made of fine material.

Specifications:
Material:
Color:
Species: 8s 11T, 8s 12T, 8s 13T, 9s 11T, 9s 12T, 9s 13T, 10s 11T, 10s 12T, 10s 13T, 11s 11T, 11s 12T, 11s 13T (optional)
Item size:
8s 11T / 9s 11T / 10s 11T / 11s 11T: 4.20 * 4.20 * 0.55cm / 1.65 * 1.65 * 0.22in
8s 12T / 9s 12T / 10s 12T / 11s 12T: 4.40 * 4.40 * 0.38cm / 1.73 * 1.73 * 0.15in
8s 13T / 9s 13T / 10s 13T / 11s 13T: 5.30 * 5.30 * 0.44cm / 2.09 * 2.09 * 0.17in
Item weight:
8s 11T / 9s 11T / 10s 11T / 11s 11T: 10g / 0.35oz
8s 12T / 9s 12T / 10s 12T / 11s 12T: 11g / 0.39oz
8s 13T / 9s 13T / 10s 13T / 11s 13T: 15g / 0.53oz
Package size: 8 * 6 * 1cm / 3.15 * 2.36 * 0.39in
Package weight:
8s 11T / 9s 11T / 10s 11T / 11s 11T: 10g / 0.35oz
8s 12T / 9s 12T / 10s 12T / 11s 12T: 11g / 0.39oz
8s 13T / 9s 13T / 10s 13T / 11s 13T: 15g / 0.53oz

Package list:
1 * Cassette cog