Rotating material of sleeve bore core and frictional material for two sides all adopt bakelite.
        The frictional strength is subject to either spring pressure or cylinder power to decide each torque assembly of slippage, for easy to control the tension adjustment in each material.
Specifications : 
● 3" Outer diameter : ψ75.5 mm
● Expanded diameter : ψ79 mm/max
● Inside diameter of paper tube : ψ76.2 ± 0.2 mm
Remarks :
(1) Sizes of inside diameter can made by suitable shaft.
(2) Other sizes of outer diameter are available on request.