1. External Thread Cap with Internal Thread Tube,Made of special polypropylene,can be repeatedly frozen and thawed.
2. Internal thread vials’ caps are with o-rings, promote more secure sealing.
3. Self standing tube is graduated and with large white area.
4. RNase & DNase free, Non-pyrogenic.
5. Working temperature from -196℃ to 121℃, Suitable for liquid nitrogen freezing.
6. caps are available for various of colors.