DescriptionVertex Forged Replica Piston KitFits Models450 SMR (23); 450 SX-F (23-24); 450 SX-F Factory (22-23); 450 XC-F (23-24); FC 450 (23-24); FC 450 Heritage Edition (23); FC 450 Rockstar Edition (23); FS 450 (23); FX 450 (23); MC 450 F (24)SpecsCompression Ratio13.1:1Cylinder Diameter95 mmDisplacement450 ccPiston Diameter94.960mm