This Lucky 7 shape was developed by Larry Ruhf for multiple competition events. I acquired this boomerang as a trade with Larry in 1989. This one was made out of 4/1 mm Baltic Birch plywood and painted on both surfaces. The underside of both blades are cambered to reduce the inertial forces and increase lift. Both of these modifications are ideal for Fast catch boomerangs. I weight tuned this boomerang by adding a coin with masking tape on the underside of the dingle arm near the elbow. This also increases the lifting forces on the lead arm and the coin is on the lower surface, so it lowers the height of the circular flight. This also makes it a better Fast catch. You could weight tune this boomerang to fly as a 40 metre Round boomerang by putting weights on the lift arm. Any way, this one was such a good performance boomerang that it lived in my personal throw kit for the past 31 years. It is in excellent condition and it has Larry's logo stamped on the underside of the elbow.