Sterile Cotton Applicator Swabs, packaged two per sterile envelope, are ideal in collection of trace liquid evidence such as blood and other body fluids. After the sample has been taken, place in one of two swab boxes offered for your convenience —preprinted or plain to allow agencies to mark directly on the box. The plain box has a pre-cut drying hole. Contact SIRCHIE® for other physiological containers not shown in this catalog. 100 Plain Swab Boxes only.