Offering maximum versatility, the 8-by-50 ml and 12-by-25 4-way Flipper® racks are intended for use with most popular laboratory tube sizes. The small footprint makes these handy racks convenient on the bench, under the hood and in a wide range of other situations. Created from rugged polypropylene, these racks are autoclavable and suitable for use in ultra-low temperature freezers (-90°C).