YABAN SFL901-DHA 9-speed superlight self-lubricating chain, made of steel with Ni-PTFE Teflon coating. The self-lubricating treatment reduces friction between drivetrain parts, limits noise, and helps decrease maintenance over time. The 6.4 mm pins have a chrome treatment to increase strength and durability, while the special machining on all sides of the links eliminates sharp edges and friction, improving shifting smoothness, precision, and quietness. Very lightweight chain: declared weight 251 g at 110L length, thanks to weight reduction on outer links, inner links, and fixing pins. Compati...