Use these cotton swabs for collecting surface contamination from flat or convoluted surfaces for analysis. Swabs do not contain any bactericidal compounds ensuring accurate results. After collecting the samples, simply transport to a laboratory for culture and enumeration. Each self-standing, round-bottomed plastic vial contains clear buffer with a cotton swab secured inside the screw cap. Store vials in temperatures between 2 and 8°C (35.6 and 46.4°F).