All sizes are designed to provide low humidity and particulate-free storage on the bench top or in refrigerator or freezers. Clear cabinets 360º visibility of the contents. These sturdy cabinets are fabricated from 6.35mm (1/4") thick material while the door is 9.5mm (3/8") thick with sealing gaskets. The deep, slide-in trays make sample removal simple and are perforated for best air circulation.