For all my science folks and lab enthusiasts out there - this 81-piece set of cryo tubes is absolutely essential for sample storage! These 2ml plastic vials are made from PP material and can handle some seriously extreme temperatures - we're talking from -112°F all the way up to 248°F. The upgraded leak-proof design is what really makes these stand out - each screw cap has an O-ring silicone gasket that creates a perfect seal, so no worrying about sample leakage or contamination. The tubes are graduated too, which makes measuring liquids so much easier. They're free from DNase, RNase, and human DNA, making them perfect for sensitive laboratory work and biological sample storage. But here's the cool part - they're not just for labs! You can use these for organizing small items like beads, spices, seeds, or even for party decorations and craft projects. The set comes with this super handy 81-hole storage box that keeps everything organized and prevents the tubes from falling out if you tilt it. Each tube measures 46mm long with an 11mm diameter, and the storage box is 12.5 x 12.5 x 5cm. The screw caps make opening and closing quick and secure. Whether you're working in a research lab, teaching students, or just need reliable small containers for organizing tiny items, these cryo tubes deliver professional quality at an affordable price. The plastic is durable but not brittle, and the clear material lets you see what's inside easily. Seriously, if you work with samples or need small, reliable containers, this 81-piece set is an absolute steal!