Kartell 299334-000W White Plastic Leakproof Test Tubes with Screwcap, 15mL Capacity (Pack of 100) Test tube with Capacity: 15mm; height: 100mm; diameter: 16mm Cap color: white-makes it user friendly Material: polypropylene test tube with LDPE screw cap Leak proof; suitable for centrifugation to 4000xg Cap design avoids any contamination due to drops of liquid on the inner surface