1250 lengthened suction head is made of medical grade polypropylene, and the filter element is made of ultra-high molecular weight polyethylene, which has good hydrophobicity. The filter element effectively forms a protective structure between the pipette and the sample, ensuring the safety of sample suction; Reduce the harm of gas residue in the gun to the operator during pipetting and improve the repeatability of the experiment. Provide low adsorption and common filter, uncoated design, no pollution to the sample, and the surface of low adsorption filter is completely hydrophobic. Can be sterilized at high temperature and high pressure. Provide sterile shelves and ordinary bags.