A high grade, handmade, pure gum rubber tubing that will retain its elasticity and softness for years. Medium wall tubing is excellent for general laboratory use. Heavy wall tubing is often preferred for Bunsen burner connections. Extra heavy wall tubing is recommended for vacuum work because it will not collapse under atmospheric conditions.
When I open the box which rubber tubing was delivered in, our whole family could not stand the smell of it. It is really bad that we did not used it. I think you should put more information next to the merchandise. If I knew it would smell that bad I wouldn't of purchased it. I end up bought another one from other place!!!