Tough-Spots Labels are steam autoclavable to 121°C, boilable to 100°C, freezable to -20°C. Pre-cut peel-off. Scuff-Smear-Tear resistant. Water-proof & Solvent resistant. Made from tough, chemically inert polyester with acrylic-base adhesive. Will adhere to all plastics and other surfaces with out peeling, drying-out, or falling off. • Round, White Tough-Spots™ Labels • For 1.5ml to 2.0ml microcentrifuge Tubes • Round, 7/16" diameter (11mm) • Made from polyvinyl, -196°C to 100°C • 1000/roll