The Buzzjet & Buzzjet Jr are now available in a "BONE" Series. They are made from a natural ABS material which is lighter and louder than the traditional Buzzjet Series. You will notice the difference between the two on a slow speed retrieve. The lighter material will have a quicker response and will want to roll more on its side. The higher pitched noise ("Squeeky") is also easier recognized on a slower retrieve. The lighter ABS material is more buoyant and has a wider roll and quicker response than the orignial.