Good seal: Transparent tubes seal very well and each transparent tube comes with a cork plug for better leak protection. Easy to use and easy to carry. Economic package: you will receive 40 transparent plastic test tubes, 40 arce sheet labels, 1 cordel 10 m long, 2 funnels, the perfect set to save time, you can tie a label to each tube as part of the inner brand. Safe material: The plastic test tube is made of PVC material suitable for food, which is not easy to break: the plastic test tube will be more stable and sure that the Glass tube in terms of storage and transport, do not hesitate to contact us if you have any questions after receiving the products.