Soft Plastic Jig Trailer Craw Bait Mold Soft Bait 4 Inch Bugmolds USA - 1 Cavity Mold. Bugmolds USA offers a high quality stone mold for 4in Bass fishing crayfish creature type soft baits. This mold is a single cavity piece that produces one soft lure that will be good for Largemouth or Smallmouth Bass, and a lot of other fish including saltwater. We recommend using lubrication for our stone molds and an injector size for this cast mold of 5/8in. Create a large variety of soft plastic baits in colors of your choosing! Nothing better when you do it yourself. Great inexpensive durable molds that are compatible with plastisol. Free Shipping in the United States On All Bugmolds USA Products!