This assortment of 22 stepped and straight tubing connectors comes in handy around the laboratory, and contains fittings compatible with tubing from 3.2 to 12.7 mm (0.13 to 0.5").Chemical-resistant polypropylene for use with a wide range of liquids or gasesIncludes 12 Stepped Tubing Connectors and 10 Straight Tubing ConnectorsFDA-grade polypropylene for direct contact with food, drugs, and cosmeticsAutoclavable