The Inex Hush hand pipe is a high-quality 4" smell-resistant piece. This item is threaded at all open ends, after using theHush Hand Pipe close all ends tightly to prevent odor from escaping. This pipe is extremely convenient since you can leave the tobacco in the bowl (half burnt or fresh) in case you are interrupted. It is also very easy to clean since you can pour the cleaning solution into the pipe and just shake it instead of soaking the entire pipe in a bag.