The Transformer™ Cube offers robust, rugged polypropylene construction for repeated storage. Included are two snap-in grids for either 15mL or 50mL tubes. Grids feature deep wells to securely hold tubes upright. Locate tubes easily with keyed lid, imprinted grid, and first tube orientation. Transparent sides and clear lid allow for easy viewing of contents. Autoclavable. Pack of 5.