Calming geometry in multiple depths – with foolproof assembly. T-Tab is part of the TAB acoustical ceiling tile collection. The product ships flat in two pieces that interlock, creating a three-dimensional shape: simply slide one piece into the other. The material and shape provide effective acoustics and pleasing aesthetics. Simply by changing their orientation in the grid, you can create an unlimited variety of patterns. Installation types: Drop the tiles into any 9/16” or 15/16” tee-grid. Concealed tile install - tiles fit neatly together edge-to-edge, to conceal the actual grid. 15/16” grid only.