KMC's Black Tech E-Bike chain with 130 links and reinforced riveted joints is optimized for 12-speed shifting systems and provides excellent shifting performance due to the Triple-X design. Non-Directional.   BlackTech Is black and stays black. KMC BlackTech is not a simple coating, but a surface treatment in which the colour becomes part of the material. The process is two-step - firstly, each individual chain component is treated and then the process is repeated with the assembled elements. The chain thus permanently retains its rich black colour and is also highly resistant to rust.   Specification 1/2" X 11/128". Pin Length: 5.2 mm. 130 Links. Weight: 272 grams. Colour: Black. Hi-Performance. Triple X-Durability. e-Bike. Non-Directional. SRAM MTB and Shimano rear 12-speed derailleur systems.