If you're always denting your ping-pong balls and always seem to run out of balls to play with, perhaps it's time you consider one that's virtually indestructible like the 3D-printed Airball. Will it revolutionise the beautiful game of table tennis? Probably not. Judging from the video alone, it doesn't look like it bounces as well as conventional balls and it probably won't sound the same either; both can be a turn-off for a lot of people. Perhaps you should just get one in case you break all the standard balls.
$10 when it was available.
