This surface sampling device consists of a 3″ x 1.5″ (7.5 x 3.5 cm) biocide-free cellulose sponge – dry or pre-moistened with 10 ml buffer. The included bags can be opened easily with attached pull tabs and offer a label area for sample identification. This Sponge-Stick placed in twirl-tie bag offers 9 months shelf life from production.