Get the perfect fit for your cryovials and microtubes with these 0.4375-inch (11mm) Tough-Spots®. This specific size is expertly designed to fit snugly on the caps of most standard 1.5ml and 2.0ml tubes without any overhang. Made from durable PVC, these write-on labels are engineered to withstand the entire cold-chain process, from long-term storage in liquid nitrogen at -196°C to heating up to 80°C. Their powerful adhesive ensures they won’t peel, crack, or fall off, providing fail-safe sample identification. Key Features & Benefits: Precision Fit: The 7/16" (0.4375 inch) diameter is perfectly sized for the caps of standard 1.5ml and 2.0ml cryovials and microtubes, ensuring a neat and secure application. Extreme Temperature Resistance: With a service temperature from -196°C to 80°C, these labels are built for deep-freeze cryogenic storage, freezer use, and general lab applications. Durable PVC Material: Tough PVC construction resists water and most laboratory chemicals, ensuring your handwritten information remains clear and legible. Strong & Permanent Adhesion: Engineered with a powerful adhesive to stick securely to small, curved, and irregular surfaces without peeling or cracking. Write-On Convenience: The label surface is designed for clear, easy marking with all standard laboratory pens and markers. Convenient Roll Format: Supplied in a dispenser box containing a roll of 1,000 spots for quick and easy application at the bench.