Knolly Delirium V4 suspension bearing kit. Fits Knolly Delirium "GEN 5" frames, released in 2019. Includes 12 pcs Enduro sealed cartrige bearings. 10 pcs are MAX (full complement) bearings, 8 pcs of which have Black Oxide anti-corrosion bearing race treatment. The remaining 2 pcs are special double-row cartridge bearings.