The Whistler was designed by Dan Blanton. When fishing the Rio Grande, which is the border between Costa Rica and Nicaragua. Silt load from the Rio Grande stains the blue water of the Caribbean for several miles. Tarpon school there in unbelievable numbers. The trick is getting them to find your fly in the muddy water. He reasoned that if tarpon couldn't see the fly, maybe they could hear it. He fastened large, hollow bead-chain eyes to a bulky fly. It was an instant success. The holes in the bead chain act the same as air blown across an open pop bottle....they whistle. Our whistlers are Pro tied on sticky sharp Japanese Dai-Riki 930 saltwater hooks.