These universal swab boxes are made of 18pt, virgin fiber, solid bleached sulfate. This stock helps prevent cross contamination and is the sturdiest swab box available. These 6.5" boxes are pre-cut with 2 breathing holes and designed to fit all swabs. Contains no biodegradable components to jeopardize the evidence. The breathable boxes are ideal for cotton tipped swabs, Cap-shure™ swabs and our Bio-Swab that have been used to collect body fluids. Ideal for swabs in sexual assault cases. Simply squeeze the box and the box pops up to prevent contamination.