... kinds of products grooved panel and perforated panel.FeatureModel No.: 13-3, 14-2, 28-4 etc. 8-8/ 16-16 ... , thickness: T15/T12/T18mmTolerance: for length±2mm, for width±0.1mm Application1. Professional space for timbre effect and decoration: Studio, recording ... room, listening room, rehearsal hall etc.2.Recreational place for sound effect and decoration:Theater,cinema,indoor gymnasium, disco, ...