Team 40's mini Aim High Vex game actually used 2.5" foam "stress" balls. Similar to
these balls. There mass is much closer to the mass of a poof ball.
Racquetballs are rather heavy, we couldn't make a decent shooter with the vex motors, but add an old Victor 883 and an old 6V. FP motor and you've got a nice racquetball shooter.
