Item Type: Roller Chain Links Material: 40MN Package List 15 x Chain Links 1 x Storage Box Before ordering the missing chain links for these bikes, please check the width and model of your bike speed chain. 115PCS IN 1 SET: Including 15pcs roller chain connecting links, with standard size and sufficient quantity, which has easy installation and replacement. 2METAL MATERIAL: Made of excellent 40MN metal material, has high hardness, good toughness, wear and corrosion resistance, with long service life. 3MAIN FUNCTION: The main chain connector link prevents the chain from thermal cracking in cold weather due to severe heating and cooling during races. 4WIDE APPLICATION: These chain master roller links are suitable for mini bikes, motorcycles and karting etc., and has a wide range of applications. 5WITH STORAGE BOX: Equipped with a storage box, which organizes and protects these chain links well, can replace old or broken chain links at any time.