These Rhythmic Gymnastic Balls are slightly smaller to make them better suited for use by children. Despite being called "training" balls they are certified for competition use by the International Federation of Gymnastics (FIG). These kids' rhythmic gymnastic balls are approximately 160mm in diameter and weigh roughly 300g.
Rhythmic Gymnastic balls are also great for training contact juggling body rolls as their large size make rolling moves easier than with smaller stage balls or acrylics.
These gymnastic balls are usually delivered partially deflated (you will need a football pump adapter to inflate).