They are designed to work with Magura brakes and are available in 4 different compounds:

The EC headsets are for frames with external bearing cups

Adaptor fittings (varies between kits)

HoseSM-BH59

Dimensions and weight: 314g

Problem Solvers MisMatch 1.1 Adaptor - Pair - Shimano I-Spec B Brake To Sram MatchMaker Shifters - 10 Speed Ignore Wholesale Tier 2 Brand Rule They are designed to workThe Problem Solvers MisMatch 1. 1 Adaptor allows you to run Sram shifters on Shimano I Spec B brakes for a nice and tidy setup. This reduces clutter on the bars and enables you to get your shifter to sit exactly where it was intended to instead of having to settle for "close enough". MisMatch 1. 0 1. 1 fits Shimano brake levers: BL M985, BL M988, BL M820, BL M785, BL T785, BL M675, BL T675, BL M640, BL M596, BL M820 B, BL M785 B, BL M675 B, BL M640 B,