USG 4290 12″ x 12″ Custom White Smooth Tongue In Groove Ceiling Tiles – 15 Pack
12″ x 12″, Smooth White, Tongue In Groove Staple Up Ceiling Tiles. Edges are Tongue In Groove, and are generally stapled in place. Or can be stapled and glued. Finished (installed ) Size is 12″ x12 “, Overall Size ( with tongue) is closer to 13×13.