Giving architects the creative flexibility to add 2D and 3D geometric shapes and perimeter panels to their ceiling designs, MetalWorks Torsion Spring Shapes are offered in triangles, parallelograms, trapezoids and hexagons in four standard colors. Easily installing on a slotted 15/16-in. suspension system in a standard grid layout, the panels are available in both non-perforated and perforated acoustical options. When backed with acoustical fleece, a standard perforation provides a Noise Reduction Coefficient of 0.70.