Target species would be any salt water but given that its only 20g in weight it could possibly be used in freshwater too for predator fish.
These lures come finished in the popular laser etched coating that most lures have these days giving the holographic effect when the light hits it. I have them in Silver finish on both sides or Candy on one side and Silver on the flat side.
The are flat on one side of the lure and curved on the other. This should make it drop in different directions as you jig the lure on the retrieve attracting the fish near by.
I only have the 20g weight at the moment which comes in at 65mm in length. It looks like it will cast pretty well for a lighter lure but I am yet to try it. I will hopefully get a cast with one this week.