Can center & Exterior selective. Suitable for material : PE ( HDPE, LDPE, LLDPE,MLLDPE......) Application: Film ,Paper 1,Color touch screen ,PLC,Auto change 2,Auto tension control, lay-on pressure control 3,Operation mode: Friction /Center /Friction & Center/gap and reverse windings 4,TH-HW -Autoload for automatic air shaft transfer, air shaft acceleration 5,Hydraulic finish roll unloading 6, ...