24 x convoluted acoustic foam treatment sound proofing tiles Manufactured from the same exacting standards as our convoluted acoustic foam these are pre-cut to size 305 x 305 x 40mm (12" x 12" x 40mm rise) Egg-crate pattern. Pack of 24 tiles. Manufactured from High quality Acoustic Foam to exacting British standards in compliance with UL94 HF1 Classification. Also Complies with the requirements of Schedule 1, Part 1, The Furniture and Furnishings (Fire) (Safety) Amended Regulations 1989.