Grower?s Edge? Cleanroom Sticky Mat comes in a 36 in x 24 in sheet, with 30 layers of tacky polyethylene film. Each sheet is 45 ?m of thickness and is numbered, showing the number of sheets left. Features a full surface adhesive backing to secure direct to the floor without the need of a frame. These multi-layered adhesive mats can effectively capture dirt and dust from foot-traffic and equipment wheels before they enter a cleanroom or controlled environment.