Mad River Shrimp Scented Trout Worms are 2 1/2" in size. They are impregnated with a specially- formulated Atlas Mike's shrimp oil. Soft and supple, yet durable, these worms have lots of action as soon as they hit the water. Trout love them! Add a floatie to the head of your Trout Worm for extra floatation and attraction.