Material of hot roller/thermo-calender roller Best quality alloy steel as material; Surface hardness HRC58-62; Way of heating: central hollow inner pipe screw heating-roller; peripherial drilling heating roller; Pattern: To the user's requirements,we can make many patterns,such as square dot,circle dot,diamond,cross,striation,andany regular and irregular patterns. Our hot roller has been ever for west germany and taiwan hot rolling machine; and we have ever made the largest asian hot roller (720x5400mm). Laser cutting machine for thermo-calender roller promotes the rollers' quality. Our quality tests great and our service prove more dependent-able.