Plastic Round Bottom Culture Tubes are the most widely referenced tubes. Falcon's industry leading high-quality plastic round-bottom culture tubes exceed researcher's requirements for ease-of-use, reliability, and versatility. These plastic culture tubes are manufactured in a state-of-the-art manufacturing facility to meet rigorous quality standards. The tighter dimensional tolerances provide assurance for consistent reproducible performance in your assays. Patented dual snap-cap enables both culturing and storage in the same tube. Leave it loose to allow for aerobic culturing while keeping your sample clean and sterile. When a tight closure is required, simply push down on the cap to obtain a leak-proof seal. This prevents leakage of your sample during handling and storage. It also prevents your sample from evaporating.