Each ZipWall Mat refill includes four pads of 24″×36″ clear adhesive sheets for use with the ZipWall^® Mat base. The sheets are individually tabbed, making them easy to peel off, and numbered so you always know how many are left. When the top sheet gets dirty, simply peel it off to expose a clean one. The adhesive surface captures dust on contact and prevents tracking it in and out of the work area.