MRP Cage Guards On Guard Protect your derailleur's pulley cage from costly damage caused by rocks and trail debris. It's cheap insurance for an expensive part. Features Pulley cage protection, shields against rock strikes and debris Durable Delrin construction, tough, low-friction thermoplastic Derailleur-specific fit, versions for Shimano XTR 9100, XT 8100, and SRAM T-Type Protects your investment, cheaper than replacing a damaged cage | Mrp | Cage Guards Shimano Xt 8100