Button Anode – AluminumUsed on Yamaha outboards: 40hp (1985-1987), 50hp (1984-1987), 70-90hp (1984-1987) Honda 40-90hpPerformance Metals Navalloy aluminum anodes are manufactured to the military specification MIL-DTL 24779 and are suitable for use in all water types- salt, brackish, or fresh.Replaces:Yamaha # 688-45251-01Honda # 12155-ZV4-A00 Specifications:Material: AluminumBox Dimensions: 2″H x 4″W x 6″L WT: 0.5 lbsUPC: 870648001284