Compatible with tubing from 3.2 to 12.7mm (? to ½"), these fittings are for the most common lab connections.• Molded of autoclavable FDA grade polypropylene except quick disconnect fittings which are polyethylene and not autoclavable or FDA grade• Kit contains: 6 Straight Tubing Connectors, 7 Stepped Tubing Connectors, 5 Wye (Y) Tubing Connectors, 3 "T" shaped Tubing Connectors, 5 Quick Disconnects and 2 flow control Plastic Tubing Clamps• Plastic organizer box has room for adding other fittings and parts