H.S. Boyd Sabertooth Perforation Backing grips the tympan on the letterpress, not only keeping the rule in register but also protecting the tympan. The backing is secured with double faced adhesive, with the sharp curved teeth along the edges gripping the tympan. Sabertooth backing is available in 15 foot lengths of 1/8" or 1/4" widths.
701B & 702B