Our E-Matrix disc brake pads are based around our Race Matrix pad compound but modified for greater endurance, adding a unique blend of kevlar, ceramics, heat resistant resins and friction materials to be able to withstand the increased weigh and speeds of electric bikes and demanding riding styles such as downhill. For use with Shimano Deore M515 M525 M575 T615 (Not compatible with M615) LX T675 disc brake systems