Romer Labs fabric swabs, also known also swab cloths, are pre-moistened with 10 ml of your buffer of choice. The cloth is a blue, biocide-free, non-woven, wood-pulp/polyester fabric, measuring at 28 x 32 cm, folded twice and placed in a 55 oz., 7.5 x 12″ (19 x 30 cm) Twirl-Tie™ bag. Bags can be opened easily with the attached pull-tabs and include a label area for sample identification. Like all microbial sampling products, they are irradiated for proven sterility.