A pre-moistened sterile swab is ideal for the collection of biological samples. Each 3ml vial contains pure sterile water. No bacteriostatic agents or other preservatives added. Internal contents sterile if vial is intact. Hold vial gently and twist off top. Squeeze vial to dispense. Discard after use. Provided in packages of either 10 or 100, or in bulk cases of 1,000.