Available in various sizes and colors, these multilayer adhesive entrance floor mats are ideal for keeping dirt, dust, and contaminates from entering a cleanroom, laboratory, or other controlled environment. Each mat contains 30 fully coated particle-grabbing adhesive sheets, which easily peel off, revealing a new clean layer. A printed number in the corner of each low-density polyethylene (LDPE) sheet indicates how many layers remain and ensures at least one layer remains before replacement is needed.