Features1The surface is waterproofing. 2Compatible with Shimano mid or long cage derailleur. 3Suitable for highway or mountains. 4The shape of cogs are specially designed for shifting performances. 5Made of fine material.SpecificationIs it difficult to change the speed of bicycle? Do you feel that it's hard to ride your bike? It is time to change the chain. Our chain is easy to install and fine workmanship. You won't be disappointed.Features:The surface is waterproofing.Compatible with Shimano mid 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: aluminumColor: silverSpecies: 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 * 0.22in8s 12T / 9s 12T / 10s 12T / 11s 12T: 4.40 * 4.40 * 0.38cm / 1.73 * 1.73 * 0.15in8s 13T / 9s 13T / 10s 13T / 11s 13T: 5.30 * 5.30 * 0.44cm / 2.09 * 2.09 * 0.17inItem weight:8s 11T / 9s 11T / 10s 11T / 11s 11T: 10g / 0.35oz8s 12T / 9s 12T / 10s 12T / 11s 12T: 11g / 0.39oz8s 13T / 9s 13T / 10s 13T / 11s 13T: 15g / 0.53ozPackage size: 8 * 6 * 1cm / 3.15 * 2.36 * 0.39inPackage weight:8s 11T / 9s 11T / 10s 11T / 11s 11T: 10g / 0.35oz8s 12T / 9s 12T / 10s 12T / 11s 12T: 11g / 0.39oz8s 13T / 9s 13T / 10s 13T / 11s 13T: 15g / 0.53ozPackage list:1 * Cassette cogPackage List1 * Cassette cog