If there is a straight punching mold, core-metal is cut into the mold. core-metal will not be able to take out, to be deformed to be issue-free exchange, flatness becomes non-standard
punching mold there is straight to the core-metal mold is p6. Core-metal, but you can no longer remove remove non-compete with Tampines Rovers and the deformation, and the flat is to be non-standard