Get the perfect fit for your cryovials and microtubes with these 0.4375-inch Laser Tough-Spots®. This high-volume pack allows you to print thousands of durable, cryogenic-safe labels for your tube caps using any standard desktop laser printer. This specific size is expertly designed to fit snugly on the caps of most standard 1.5ml and 2.0ml tubes without any overhang. Engineered for extreme conditions, these labels will remain adhered and legible from liquid nitrogen at -196°C to boiling and dry heat up to 150°C. Key Features & Benefits Precision Fit for Microtubes: The 7/16" diameter is perfectly sized for the caps of standard 1.5ml and 2.0ml cryovials and microtubes, ensuring a neat, secure application. Desktop Laser Printer Compatible: Formatted on standard sheets to work seamlessly with your existing laser printer for easy, convenient batch printing. Extreme Temperature Resistance: Built to endure a remarkable temperature range from -196°C to 150°C, making them ideal for long-term cryogenic storage, boiling, and dry heat applications. Chemically Inert & Durable: The chemically inert material and strong, solvent-resistant adhesive ensure your printed information remains intact, even with chemical exposure. Strong & Permanent Adhesion: Engineered to stick securely to small, curved surfaces even through extreme temperature shifts and processing.