significantly increasing the cooling effects in for example an annealing oven that can result in the consumption of additional fuel to maintain an elevated temperature in such a device or 2 the amount of water that must be circulated through conduit 16 to obtain appropriate cooling of tubular shell 42 thus when assembled by the insertion of roll core 12 or tubular member 18 having annular discs 30 attached thereto as described above into a new or reworked tubular shell 42 foils 32 enter into interference fit into the inner periphery 50 of tubular shell 42 providing the support and heat exchange advantages described above there has thus been described a novel insulating sleeved transfer idler roll system that provides a simplified and reliable method for the attachment of a replaceable tubular roll shell as well as a novel interior roll configuration that provides enhanced shell cooling control the use of foils that extend from the outer surface of an interior conduit to and beyond the outer periphery of an annular laminated compressed inorganic material disc bundle to frictionally interferentially engage the inner surface of a tubular outer shell has also been described along with its apertenant benefits while the tubular shell described herein is currently fabricated from metal it will be readily apparent to the skilled artisan that in view of the method of attachment described herein tubular shell 42 could be fabricated from any number of alternative materials for example ceramics or cermets that can be fabricated into tubular shapes as described herein.