Full Length Standard Taper Glass Stoppers
![Full Length Standard Taper Glass Stoppers](https://krackeler.com/tt/lg/graphics/0186/jpg/851000-2440-1.jpg)
Pennyhead stoppers can be used with laboratory glassware such as flasks and separatory funnels.
- Sizes Standard Taper 10/30 through Standard Taper 19/38 are solid
- Sizes Standard Taper 24/40 and larger are hollow
- Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements