PTFE SYRINGE TUBING, 12 INCHES LONG, KEL-F® FEMALE LUER-LOCK HUB ON ONE END, KIT CONTAINS GAUGE NUMBERS 28, 24, 22, 17, 16, 12 RECOMMENDED MINIMUM SIZE NMR TUBE - 1.5MM O.D. THIN WALL TUBES - SUITABLE FOR ALL LARGER SIZES