We at Heraeus have been dealing with tubes for a long time. Over the years we have developed our own vocabulary when taking about the geometric properties of tubes. Not all might be intuitively understood, therefore, we try to visualize them for you below. Please note, that not all properties are part of a specification, but they might be and tolerances are a key factor in determining the price of your product. For an overview of the available tubes check out our product pages .