Membrane boxes are tight containers that are fitted with two thin elastic membranes that wrap around the object and hold it firmly in place.  Thin, thick, round, sharp, irregularly shaped, or even grain sized objects can be kept firmly in place with assurance of no movement. 

The transparent boxes are made from clear polystyrene with a very stretchable polyurethane membrane.  When the top and bottom of the box are brought together the membranes fit tightly around the object, holding it and protecting it from harsh movement or vibration.  Because the membranes hold the object suspended in the center of the box, it can be viewed from both top and bottom.