During my trip to Maldives for Giant Trevally, the Shimano Orca outproduced any lure I had. The Orce has an internal weight which causes it to produce an erratic pop and dive action. It has wire through construction and comes in lengths of 6 1/2 inches weighing 2oz and 71/2 inches weighing 3oz. I used the 3oz Orca during my trip. Shimano has recently come out with a Pop Orca weighing 5oz. Hopefully the waters levels will be low on my next adventure to La Zona as I feel this lure will be fantastic on huge golden dorado.