These balls are the closest weight to acrylic balls of any stage ball we've come across. Each 70mm practice ball is made from heavy rubber (with practically zero bounce). The material used is slightly sticky making them very forgiving for beginners. 70mm is an appropriate size for children practising single ball contact juggling or for anyone who prefers a heavy stage ball. There is a very subtle seam around the equator of the ball. Available in 5 colours.