1、Double X Bridge Design: It reduces the interference between the chainring teeth and the chain during shifting, significantly reducing noise and friction and delivering a comfortable shifting experience. 2、Corresponding Guide Angle Design: The symmetrical guide angle of the chain's outer piece ensures a smoother and harmonious linking with the chainring and flywheel during shifting and contributes to quicker shifting reactions. 3、High Pin Riveting Force: Parallel riveting process tightly combines links to form the sturdy connection nowadays which allows the chain to withstand strong pedaling force like a machine during high speed abrupt shifting. 4、Long Term Use: Bike chain has high rigidity, high abrasion resistance, sturdiness and durability, and long service life. Provides efficient pedal force transmission and stable momentum transfer, enabling riders to win at the starting point and maintain a high transmission rate. Tested by professional riders, the lifespan can get 1.5 times that of ordinary chains. 5、Lightweight, Mud Drainage Hole Design: Precisely designed hollowed out structure of the inner and outer chain pieces, reduces the overall weight while maintaining strength. An excellent choice for those pursuing a lightweight setup or for long distance cycling. Item Type: 12 Speed Bike Chain Material: High Strength Medium Carbon Steel (C50) 1 x 12 Speed Bike Chain 2 x Chain Connector 1 x Storage Box