This kit contains both the upper and lower bearings used in the headsets of Alpine Trail 

Compatible with Alloy, Carbon and E Trail bikes.

Kit contains:

1 x P03K (MR122 TH873E) 30.15 x 41 x 6.5H - Internal & External Angle: 36/45

1 x MR127 (MR127 TH073E) 40 x 51.8 x 8H -  Internal & External Angle: 36/45