I have a 2 year old Black Lab that lives for playing fetch. This dog will play all day long, much longer than my arm can last by any means. I bought a ball launcher, and that has saved my arm from aches and pains more than I can tell you. But tennis balls last only about five minutes before he has them broken on the inside, and they don't fly well. I decided to turn wooden spheres, out of maple, to a size just a bit larger than a baseball. Great practice by the way. These work well, but they can get damaged if they hit a concrete driveway or such. So I made a ball out of the hardest wood I could find, I think it is peach. Very hard, very heavy, longest lasting ball so far. Now heres where you find out how dumb I actually am. I take the ball to the lake and launch it as far as I can. Off goes the dog, see's the splash of the ball and swims to the general area of the landing. Trouble is THE BALL SANK!! Now this dog has a never give up attitude. So after ten minutes of me trying to coax him back, I have to run back to the house, and get a fresh tennis ball that I know will float. This has all taken by now maybe fifteen minutes, and he's still swimming looking for the first ball. Moral of the story, make sure your ball floats before you send your dog in after it. Heres a pic of what I think is peach... Now back to the title, who's more dense, Me or the wood?