Fisherbrand Microcentrifuge Tubes 1.5mL Graduated Tube with Flat cap natural Fisher Scientific Manufactured from durable chemical-resistant polypropylene 0.6mL tube is graduated in 0.2mL increments; 1.5mL tube, in 0.5mL increments with an additional graduation at 0.1 and 2.0mL size, in 0.5mL increments Designed for use in critical applications where minute sample recovery is important Withstand speeds up to 30,000xG Recommended for freezer-to-centrifuge use Autoclavable up to 120 C and withstand freezing temperatures as low as -80 C RNase/DNase free