Transition Sentinel Suspension Bearing Kit. Fits Sentinel alloy and carbon fiber frames from 2018-2019. Includes 12 pcs Enduro MAX (full complement) sealed cartridge bearings, all of which have Black Oxide anti-corrosion bearing race treatment. 2 pcs are special cartridges with double-rows of ball bearings inside. NOTE: If black oxide bearings are not available, Enduro MAX bearings without the black oxide finish may be substituted.