Borosil Reusable Class B Serological Pipettes are graduated using a permanent amber treatment that will not wear off even after reuse. Manufactured with consistent wall thickness. Reusable. Uniform inner bore diameter for accuracy between different readings. Beveled tips resist chipping. Pipettes can be autoclaved and, if necessary, flame-sterilized. Borosil Serological Pipettes are graduated for delivery from the zero mark to the tip, without "blowing out" the droplet remaining in the tip. Borosil Class B Serological Pipettes comply with EN ISO 835. Available from 1mL to 25mL. 1mL, 2mL and 5mL size available in two different graduation intervals. Manufactured from the same USP Type 1 borosilicate glass that North American scientists have come to trust, Borosil Laboratory Glassware offers unparalleled mechanical strength, clarity, and reliability at competitive prices.