ZTTO 11-42T 10 Speed 10s Wide Ratio Sunrace for Bicycle Bike MTB Gears Cassette Sprockets in Mountainous Region and Highway Is 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. Made of tensile steel plate which intensity is more strong. Compatible with Shimano mid or long cage derailleur. Designed hollow and can reduce the weight. Suitable for highway or mountains. Specifications: Brand: ZTTO Material: stainless steel Color: silver Species: 11-40T 9 speed, 11-42T 10 speed (optional) Item size: 11-40T 9 speed: 17 * 17 * 4cm / 6.7 * 6.7 * 1.6in 11-42T 10 speed: 17 * 17 * 4cm / 6.7 * 6.7 * 1.6in Item weight: 11-40T 9 speed: 515g / 1.1lb 11-42T 10 speed: 526g / 1.2lb Package size: 11-40T 9 speed: 19 * 18.5 * 6cm / 7.5 * 7.3 * 2.4in 11-42T 10 speed: 19 * 18.5 * 6cm / 7.5 * 7.3 * 2.4in Package weight: 11-40T 9 speed: 632g / 1.4lb 11-42T 10 speed: 613g / 1.4lb Package list: 1 * Cassette sprocket 1 * Internal angle screw 1 * Screw