Trek Top Fuel suspension bearing kit for frames manufactured from 2017 through 2019. Includes 10 pcs Enduro MAX (full complement) sealed cartridge bearings. 4 pcs are special double-row bearings. 4 pcs have Black Oxide anti-corrosion bearing race treatment. NOTE: If black oxide bearings are not available, Enduro MAX bearings without the black oxide finish may be substituted.