"INCLUDES ALL STEEL WELDED CONSTRUCTION; REMOVABLE PANELS FOR EASY ACCESS FOR CLEANING AND MAINTENANCE; CHAINS, BELTS, SPROCKETS, AND PULLEYS ARE FULLY ENCLOSED; GAS AND ELECTRICALLY HEATED MODELS FEATURE A FULL 12 INCH DIAMETER STEEL CYLINDER; STEAM HEATED MODELS FEATURE AN 11 INCH DIAMETER HEATED CYLINDER CONSTRUCTED OF ASTM A53 GRADE B STEEL, TESTED TO 350 PSI; MOTORS ARE INDIVIDUALLY FUSED AND THERMALLY PROTECTED; AN INFINITELY VARIABLE SPEED DRIVE ALLOWS ADJUSTMENTS TO ANY SPEED BETWEEN 10 AND 30 FEET PER MINUTE; PADDING AND COVER CLOTHS ARE NOMEX MATERIAL; THE ENTIRE MACHINE IS FINISHED WITH HIGH GRADE MACHINE ENAMEL"