Low-cost, wood fiber panels that are ideal when fire resistance, acoustical performance and accessibility are not significant considerations; offers simple staple-up installation that does not require a grid; tongue-and-groove edging on the tiles hides staples, delivering a smooth, clean, monolithic look; retail equivalent of Armstrong's Grenoble 258. 12 in x 12 in x 1/2 in with Staple Flange.