A nice touch is the rubberized plastic grip on the weapon handles.
M.U.S.C.L.E. Kinnikuman keshi Copper Bellman Skin Figure Bandai Vintage Japan
What stands out about the material is PVC’s resistance to dents.
M.U.S.C.L.E. Kinnikuman keshi Copper Bellman Skin Figure Bandai Vintage Japan
You will notice the PVC gives it a shiny look that catches the light.