Crystal tubes are typically made of glass and provide an airtight seal. They are often used to store and display cigars, as they protect the cigar from external elements such as humidity, dust, and dirt. Cedar tubes, on the other hand, are crafted out of cedar wood. The primary benefit of a cedar tube is that it can help improve the flavor profile of your cigar by allowing natural oils to slowly seep in over time. Some believe that storing cigars in a cedar tube can add complexity to its taste by introducing woody notes into the smoke.