Pipette tips are available in 6 sizes:

The pipette tis is an indispensable experimental instrument in biological research, and the number of its accessories tips used in the experiment is also very large. The tips on the market are basically made of polypropylene plastic (colorless and transparent plastic with high chemical inertness and wide temperature range). However, with polypropylene, the quality can vary greatly: high-quality tips are generally made of natural polypropylene, while low-cost pipette tips are likely to be recycled polypropylene plastic (in this case, we can at most Said its main ingredient is polypropylene).