Every headset part of the headset assembly is including in this kit. Top cone for ICS 1 (flat steerer fork), top cone rubber seal, nylon compression ring, alloy compression ring*, MR155 upper bearing, MR196 lower bearing. *: If provided, never use the black alloy compression ring with a carbon steerer tube. Always use the green nylon compression ring instead. Compatible with Teammachine SLR 01 Gen 3 and Alpenchallenge AMP. - Teammachine SLR01 Disc Gen 3 (MY18, MY19, MY20) - Alpenchallenge AMP (MY19, MY20, MY21)