These disposable conical-bottom and freestanding sterile tubes feature easy-to-read graduations and smooth inner walls for easy filling and sample preparation. Rack-packed tubes are packaged in freezable, recyclable, autoclavable racks, and stackable rack designs make them ideal for benchtop organization. Caps are available in either flat or plug styles. Certain models are designed to provide protection for light-sensitive samples, manufactured from a dark polypropylene. Sterile, DNase- and RNase-free centrifuge tubes come in packages of 25 to 500 and are also available in the screw cap. Pick your preferred style of centrifuge tube ID field. Alternatively, many of our conical tubes have easy ID color strip labels, so no additional identification via sticker, cap, or plug is necessary. These high-quality, high-performing centrifuge tubes are ideal for maintaining a secure seal when using shakers and horizontal incubators.