【Reliable Material】The centrifuge tubes is made of quality polypropylene, the plastic vials with good thickness, very durable, do not crush or crack easily, clear plastic sample tubes, no bubbles and no impurities. These plastic tubes with caps are very clean, no stray edges to be cleaned up. Definitely a safely airtight containers..【Specification】The capacity of test tubes with lids is 2m. Scale of container shows with 0.5ml, 1ml, 1.5ml, 2ml. It is more convenient to control capacity. Ultralight pack easy to carry..【No Leakage】The cap of plastic tubes is flat with consistent thickness for trouble-free piercing and forms a tight, they snap closed tight so no worries about them accidentally opening up, an excellent seal on the cap, keep your testers completely sanitary. It is also easy to close and open, even when wearing gloves..【Multipurpose】The vials with caps, it has excellent cap closure, no issues with leaking. Great for liquids, DNA extraction experiment, seed container, mixing solutions, measuring powders, biological research, food coloring, craft use,geocache containers, insect specimen, liquid makeup and beauty products, sample cups, use a micro centrifuge to separate proteins from the sample matrix, etc..【Package Including】100 packs micro centrifuge tubes, sufficient quantity for using. Inner diameter:10mm; Length: 40mm, perfect for putting in Geocaching gift bags.