Do-It FG-12 Fiberguard Weedguards - Made of individual strands of nylon bristles, fused together at the base. For use in Do-It Molds. Be sure to order the exact base diameter specified by each mold. Some base sizes offer a choice of stiffness; that's strictly up to your preference. You'll also notice that Fiberguards are furnished extra-long to fit a variety of jig styles and hook sizes. Simply trim Fiberguards with scissors after molding for a final fit.