This friction lining is the replaceable wear surface bonded to the pickup drum of a self-propelled forage harvester. It provides the necessary grip to engage and pull the crop mat into the feed rolls. As the lining wears, the drum loses its ability to consistently feed material, leading to slippage and reduced throughput. The manufacturer machines this lining to the original drum's curvature and thickness, so it seats flat against the drum surface without requiring additional shimming or adhesive buildup. On installation, ensure the drum face is clean and free of old adhesive residue before bonding the new lining.