Just a note to clear up some confusion. When using the heat tubing as featured in the "Fly of the Week" the wing-burner is used as a press to seal the ends of the material. Leave the wing-burner on the table top, heat the end of the material until it starts to shrink, and place the tip of the heated end in the wing-burner and press down on it. with both ends sealed you get an air-filled body. Hope this helps.