... slinky, the surface is smooth .2)Japan Toshiba vacuum electron tube, powerful output, 1-10 ton air pressure, oil pressure ... fast and accurate.3)American NL-5557 high sensitive sparkle protection tube and circuit ,automatically cuts off the high frequency, restrain the ... is easy and quick for the mould adjusting6)Overflow protection prolongs the tube life span and protect the mould7)Cylinder from ...