The material used for Morpho Detection, Inc.'s sample traps uses a high quality Teflon® coated fiberglass optimized for use in MDI's trace detection equipment. Sample traps are manufactured and tested under strict laboratory and quality controls in order to ensure the proper functionality of MDI trace detection equipment. For ease of identification, sample traps are stamped with the a centered hole. Sample traps are intended for up to 10 sampling events and should be discarded once this level or a qualifying event as identified in your user manual is reached. In order to maximize the longevity of this product, the container should be securely closed immediately after obtaining the required trap.