Campagnolo`s EKAR chain is specially made to be used with the new EKAR 13 speed 1x drivetrainRequires the use of Campagnolo chain tool designed for EKAR 13 speed chainsAvailable with or without a connecting link, Campagnolo 13sp chain tool required for installation of the model without connecting link13sp118LCampy Chain Tool RequiredSilver4.9mmUPC/EAN/GTIN: 8053340455483