No Mudding needed! One Simple step. Works for both wood and steel construction. Since 2002, E-Z Tape's fire tape ahs been rated for use in fire wall construction in the United States and Canada. Permanent adhesion to drywall. Easy mudless application. Saves up to 60% of installation time over conventional taping methods. Works with both wood and steel beam construction. Listed by ICC Evaluation Services and Intertek Testing Services (Warnock-Hersey). Rated for use in Fire Wall construction in Canada by Intertek Testing Service. One and Two Hour rated firewall construction. Not rated for ceilings. 250 feet per rool - 1.89" wide. Dimensions: 7-1/2"H x 6-1/2"W x 2"D.