Spinner bait skirt. I made this skirt from extruded silicone caulk but it may be a good candidate fro ninjaflex or similar material. I did catch a larger fish (32 inch Northern Pike) with one of these skirts but I didn't have a camera along for that trip. More information about my silicone caulk extruder setup is available here: http://www.scorchworks.com/3Dprinting/3dprinting.html