Intense M16 suspension bearing kit for all M16 frames, aluminum and carbon. Includes 4 pcs Enduro MAX sealed cartridge bearings with 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), plus 4 pcs Enduro MAX shielded, greaseable bearings (for frames with "Zerk" grease fittings).