A tube on which web materials (textiles, tape, paper, etc.) are wound. In U.S. industry, common inner diameter sizes are 1", 3", 6" and 12". Steel cores are often used for winding delicate foils, as the weight of a large roll of foil would break less durable cores, deforming and tearing the rolled material. Cardboard or plastic cores are usually used for tape, produced in lengths of 4-6 feet, cut down on a core cutter machine in normal tape widths before winding the tape on them.