Pack of 30 : 12" x 12" (finished size) Tivoli Tongue In Groove , Staple Up Fiber White Ceiling Tiles. Tivoli tiles are a simple, tongue in groove, staple up design used for beautiful simple ceilings. This is a "textured" , (not smooth) design , which means it has indentations in the surface . Paintable . Overall size (with tongues) is close to 13" x 13" , finished size (after install) is 12" x 12" .