CGC's Sheetrock Flexible Gypsum Drywall Panels are designed to offer greater flexibility than standard 1/4 in. (6.4 mm) gypsum panels. Ideal for curved walls, archways and staircases, these gypsum panels feature a noncombustible gypsum core that is encased in 100% recycled face and back papers that form a high strength composite design. The face paper is folded around the long edges to reinforce and protect the core, and the ends are cut square and even.