Produced from polypropylene (PP) Provided convenience of 1.5mL microcentrifuge in a tube that holds larger volumes Attached snap cap facilitates one handed opening and closing Pierceable cap allows easy access by needle or syringe Dual graduation scales in in increments of 0.5mL and 0.2mL enable more precise measurement when required Suitable for use from -86° to 80°C for low temperature storage and general laboratory use Seven color options for sample identification and organization The tubes work GREAT with our low profile Grip Rack