BeHerk Vacutainer Blood Collection Tubes: This collection tube is very easy to use and simple to operate, giving you huge convenience. ? The test tube is well sealed to keep the stored objects free of dirt and moisture, safe and reliable. ? Suitable and wonderful for research institute, laboratory, and Veterinary ? The stable and sturdy Glass test tubes can meet your requirements for sample collection. Specifications: 1.6ml ESR Tube with black cap 100pcs of wrap packaging. Sodium Citrate.