SRAM RED eTap AXS 12sp ChainSRAM Red AXS 12 speed chain features a unique link shape which allows the chain to be narrower and lighter. At the same time, it increases strength and provides more tolerance between the cogs. The Flattop technology ensures a quieter operation with better durability. The Hard Chrome plated inner and outer plates is ideal for a faster and more precise shifts. Plus, the Hollow Pin construction increases the efficiency.