Labtop coolers made of polycarbonate. For 1.5-ml microcentrifuge tubes. Adapter available for 0.5-ml tubes. After pre-cooling will maintain a temperature of -15 to -20°C on the laboratory bench for up to 2 hours (for 32 cavities and 1 hour for 12 cavities). Stackable, with rubber feet, markable lid. 16 adapters for 0.5-ml tubes included.