If you lose it, you have to replace it with
a similar rubber ball bought separately.
Not exact matches
The type that is
similar in shape to a bicycle horn should not be purchased as the
rubber balls can allow build - up of harmful bacteria.
Similar to modern racquetball, teams of 2 - 6 players would compete to keep a large
rubber ball (up to 9 lbs / 4 kg) in play without using their hands.