devised for the secure storage of atmospheric particulate matter sampling membranes, ensuring integrity and accuracy of your samples. Constructed from stable polystyrene, this storage box prevents and preserves the composition of your filter membranes. Features a special extraction port for easy access to individual filter membranes, enhancing efficiency during sampling processes. Anti-skid devise with a rough particle area on the edge for a firm grip, making it easy to handle even in challenging lab environments. Includes 10 pieces in a set, providing ample storage for various sizes of filter membranes to meet your specific sampling needs.