Fully autoclavable. Molded from reinforced nylon for strength and durability with no coatings to chip, peel or rust. Single piece, three tier grid design for secure and stable racking of tubes. Good temperature and chemical resistance to withstand a variety of lab procedures. Large, flat endplates for labeling and easy sample identification. Dense nylon material will not float in water bath. 15mL conical tubes fit 20mm racks and 50mL conical tubes fit 30mm racks. Seven color options to keep samples and benchtop organized. Half-size racks fit easily in ice and water baths.