Banknotes are not a good snorting tool
What applies to the drawing surface applies even more to the drawing tube itself. Many consumers still use banknotes. However, banknotes are massively contaminated with all kinds of bacteria and the risk of a disease infection increases enormously. If you don’t use a proper draw tube at home, at least use a straw or a piece of paper – this prevents injuries. The best choice is the oneGee Pipe Set, though. It combines high-quality materials with swiss precision engineering.