ZipWall Mat Refill includes four packs of 30 clear adhesive sheets (60×90 cm) for use with the ZipWall® Mat base. The sheets are individually tabbed and also are numbered, that makes them be easily peel off as well as you may always know how many of them 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.