This is a 12 inch hard resin head lure with a double skirt tied and glued to the head.  This style lure is probably the most deadly tuna catching lure on the east coast and can probably be found on every sportfishing boat from North Carolina to New England.  Best if trolled at 5.5 to 10. knots either by itself, in a spreader bar or behind a bird in the middle of your pattern.