MSE PRO Foam Box (68x68x22 mm) for Delicate Materials Storage (Pack of 12)MSE PRO Foam Box (68x68x22 mm) for Delicate Materials Storage (Pack of 12) These popular foam boxes is composed of a sponge foam and plastic box. The foam is made of PU. They are great packaging solution for items that might experience strong shaking and vibration during transport. They are widely used for storage and shipping of delicate materials, such as semiconductors, optoelectronic devices, wafers, and optical components. These foam boxes