We continue the craft, which has always been a tradition in the Czech Republic. The straws are made in the family glassworks in Podkrkonoší from high-quality borosilicate glass, which is resistant to breakage. On a Mohs hardness scale (where the diamond is 10 and chalk 1), borosilicate glass is rated 7.5 points. Ordinary glass has only 5 points. The straws love the dishwasher or can be cleaned with the brush that is included.