The Yamamoto 4″ Slim Senko really shines when you are going after finicky bass and need the maximum action and attraction out of your drop shot, split shot or bead ‘n bullet. Gary Yamamoto created the 4″ Slim Senko for his top tournament pros in Japan who required a smaller, slimmer Senko to excel under highly pressured conditions. The beauty of the Senko is in its simplicity. The Senko may look like just a thick round plastic worm but the fall rate created from the large amount of salt impregnated in the body drives fish mad. With its wide range of uses and subtle natural action the Senko has quickly become a favorite with anglers all over the world.