paper painting cover box,painting round box,paper tube 1.keep your painting or pictures in moistureproof,waterproof 2.OEM,ODM paper painting cover box,painting round box,paper tube 1.Feature:Cylinder,Straight core tube,no spiral trace and being more rigid than spiral core tube made by same and equivalent paper material.2.Materials:Art paper,card board paper board,grey paper,special paper,PP or PE ...