Alvin black edge binding tape is made from a tear-proof PVC material that protects and color-codes valuable drawings and documents. Great blueprint and document-binding tape for use in the field. BLACK 1/2" wide roll is 80 feet long and has a 1-3/8" core. For use with Alvin #5499 Reinforcer Edge Binding Machine. BOX OF 10 ROLLS. Alvin 121BK edge binder tape is made in Germany.