Limite production. Precision CNC carved from Aluminum 7075-T6, these hubs are made as a high performance option for the MBS Rockstar II Hub. We have put the best technology on these bad boys, our HANDSHAKE clamping system provides best rigidity on an eSk8 hub and the double angular contact bearing is the best and most reliable in the market. Compatible with all equipment using MBS Rockstar II Hub Also all MBS.COM Matrix II trucks systems: Oil Slick, Metal Matrix II, MBS Matrix II. Fits axle 12mm diameter. INCLUDES: 2- Double row angular contact bearing. 1- 12 x 6 mm Spacer. 1- Hardware set. Price is for single Hub.