Vapetool capped filter tubes are designed in Germany and made in the USA using laboratory grade borosilicate pyrex glass and then individually wrapped in a protective box.  The glass and caps will not leach and can handle the extreme tempuratures needed in the extraction process.

The filter caps are solvent-safe polypropylene caps that keep the screen in place, reduce damage, and are air tight.  They provide a dual-sided opening 5mm hole for solvent application and are compatible with strong solvents.