SONEX HARMONI ACOUSTIC Ceiling Tiles are made from lightweight, non-fibrous, open-cell expanded melamine WILLTEC foam and have a 1/2” (13 mm) tegular edge. Smooth-surface HARMONI Vista panels and the lightly sculpted surface pattern of HARMONI Tartan panels are produced to suit typical 15/16” (24 mm) grid system. HARMONI Ceiling Tiles are readily available in a variety of standard water-based acoustic coating color finishes.