WELLYOUNG Perforated gypsum board WELLYOUNG Acoustic Board is a perforated 12mm gypsum board with air-cleaning effect including black or white acoustical EU standard Ahlstrom non-woven fabric on the back(special color when ordering). Main Features Acoustic perforated gypsum board Light weight in unit acreage High edge rigidity Strong nail pull resistance Smooth,paintable surface NO visible joints and grid Sustainable,fully recyclable material Installs on any standard drywall suspension system Green environmental protection material Specifications: Based board Knauf gypsum board or common gypsum board Thickness 12mm Size 1200*2400 Square hole 3/8.33, 5/15, 8/20, 10/20, 12/25mm Round hole 6/18.18, 6/20, 6/25, 8/18, 8/17, 8/20, 8/25, 10/20, 10/25, 12/25, 15/30mm Cross hole 6/10/20, 6/10/25, 8/12/25, 12/20/30mm Irregular hole 8/15/20 Oblong hole 4-14mm