The 6' fiberglass spears will take most of what you want up to 30# snapper and grouper, maybe bigger, but I've personally witnessed it done and have taken 20# fish myself on several occasions. One important thing to being successful with a pole spear is to stretch the band as far as you can, I like to strectch the band all the way to the tip. When you do this, some of the poles will want to "bow" so to prevent the bowing, give the spear a twist as you "load". This will help keep it straight. Also, a single pole spear will not suffice unless your carrying it along with a gun. Get at least 3, four or five is even better. Once you kill the first fish, use that spear for your stringer, load and shoot with the rest. Damn, now I want to go stick something.