A-MAZE-N OET-0002 Oval Expanding Tube Smoker, 12"-18", Silver Expanding Tube Smoker easily goes from 12" to 18", just pull to expand it Produces smoke for up to 4 hours in the 12" position and 6 hours in the 18" position during Cold Smoking or while supplementing smoke at 225 Degree+ in your grill or smoker 12"-18" size makes it easy to use with almost any grill! Oval tube design helps keep it in place and not roll away Produces very little ash