PBO fiber can resist high temperature is up to 600℃. PBO layer enables the roller sleeve to work continuously under temperature of 550℃, and can stand the abrasion from different shapes of the aluminum profiles.The needle-punched roller that combines PBO and Para-aramid is the ideal product to use for the extrusion initial area and run-out table. Color:Surface brown and yellow underneath Working Temp.:550℃ for long time and 600℃ for short time Overall thickness:6mm,8mm,10mm, 12mm Thickness of PBO layer:2mm, 3mm, 4mm