Cutting machines can't work without cutting dies. Cutting dies can't work without the protection boards and cutting die rubber insert. Cutting die inserts as usual is by rubber foam or called elastic foam. This kind of rubber foam has enouth thickess (8mm,10mm, 12mm), enough hardness, which will push out the cutting pieces from the cutting knife but keep the shape. It help the cutting piece not stuck into the cutting dies to make the cutting automatic and continous without interruption.