For almost a decade, I marketed plastic boomerangs designed by Barnaby Ruhe and manufactured by brothers Bill and Charles Springer. These were great flyers and they were made out of different materials. The most common material was Polypropylene foam which gave the boomerang the same density as it would have if it were made out of Birch plywood. Unknown to most, this boomerang came out of the mold warped and unable to fly, so they had to be heated and bent into a proper tune. I found that there were subtle differences with each one, so I had to throw about 30 of them to find a perfect match for competition grade Jugglers. A matched set had the same flight range and height. This pair is a matched set made out of red Polypropylene material. I used this set in competition for almost 10 years. Juggling takes as much athletic effort as playing tennis. The good news is that these can be thrown as individuals and they are incredible sport boomerangs with a low and circular flight, sort of like a slow Fast Catch. They also float is you want to use them near water. This set has light wear and a few scuff marks near the tips from use, but no damage.