1Shift Smoothly: The outer chamfer design prevents the teeth from interfering with the chain to shift more smoothly. Applicable to all types of 12 speed, 2x12 speed and 3x12 speed drive system. 2Alloy Steel: Bike speed chain is made of alloy steel with high hardness and high strength, rustproof, durable, greatly enhancing service life of your bike. 3High Strength and Rigidity: The bicycle chain is embedded with a high strength axle center and a high rigidity reinforced structure, which is tight, flexible and not stuck, and can withstand high treading force. 4Half Hollowed Design:The bicycle chain adopts a precise half hollow design, which can reduce the overall weight of the bike while ensure the strength. 5Applications: Alloy steel 12 speed bike chain is suitable for most bicycles, mountain bikes, road bikes, etc. Perfect bike replacement part for long time and long distance riding. Item Type: 12 Speed Bike Chain Material: Alloy Steel Gross Weight: 320g / 11.3oz 1 x 12 Speed Bike Chain 2 x Chain Link Connector 1 x StorageBox