Butyl tapes help prevent and reduce costly water damage. Tough rubber, pressure sensitive mass, offers excellent adhesion to a variety of surfaces (no applicators required). Consistent width and thickness from start to finish of each roll. Used to seal out dirt, dust, moisture and water. Easy to use in tape form. Low moisture vapor transmission value. A must requirement in any sealing application. Comes in a rugged, reusable, re-sealable package for storing.