I started out making rat-L-traps and have come a long way since my first ones. I make them out of Popular. I cut the general shape i want then cut the bait in half lengthwise. Then i hollow out 2 cavities on each half, one for the weight and the second for the steel shot. I make one of the cavities almost the size of the bait got give the shot a lot of rattle. The cavities for the shot, i coat with epoxy, gives it a nice, loud sound. After you have the weight and shot in, glue the 2 halves together and finish shaping the lure. You can also make rattles out of copper tubing, but i find that the coat of epoxy is a little louder, and easier. Hope that helps some.