Brush head 5 mm in diameter is very suitable for ordinary drinking pipette and bottle pipette. Made of 18-8 food grade 304 stainless steel Total length 173mm, 5 mm spiral brush head Bisphenol A-free, easy to use Pipette cleaner is the most convenient tool for reusable pipette owners, making it easy to clean pipettes. Made of high quality stainless steel with nylon brush. It is very suitable for cleaning stainless steel and glass pipettes. Easy to clean: Suitable for cleaning glass pipettes or anything with small openings. These pipette cleaners combine perfectly with our classic and smooth pipettes. We recommend thorough cleaning of the new straw cleaner with soap and water before use. Because of its simple design and uniform bristle spacing, the particles can be easily washed out with water. After each use, your straw cleaner should be dry and stored in a dry place.