From the product description, check product page for current description, price and availability:
- Non-toxic and chemically inert to biological ﬂuids and most acids.
- Can be heat sealed to use for liquid storage or transport.
- Pipets can be frozen in liquid nitrogen.
- Produced from a custom grade of low-density polyethylene (LDPE) to make them non-slippery. This makes Globe Scientiﬁc pipets easy to grip with gloves.
300 mm is just shy of 12″ at 11.811″, 23 milliliters/CCs is about .78 ounces.
I have these and the length makes them long enough to take refractometer samples directly from the fermenter. Of course, that’s going to depend on your fermenter.