The Beadex paper-faced metal inside corner bead is designed to form a true inside 90°corner. For use on any thickness of wallboard. It is manufactured with strong paper tape that is laminated to a sturdy, rust-resistant metal form. It resists edge cracking and chipping, resulting in corners that stay beautiful despite normal building movement and everyday wear-and-tear. It is of a white color, measures 5/8" x 5/8" x 8' and comes with a 30-year limited lifetime warranty.