1ml volume Mini-Tubes offer a convenient and economical means of performing laboratory procedures using multi-channel pipettors of four, eight or twelve channels. The Mini-Tubes are made of virgin medical grade polypropylene resins. The Mini-Tubes feature an attachment bridge between tubes, forming a Mini-Tube strip which can be easily separated into single tubes by cutting apart. Polypropylene Mini-Tubes may be autoclaved at 121°C (250°F). May be frozen to -40°C. 4,800 tubes per box.