Pro Swingball is the ultimate Swingball, perfect for older children and adults who enjoy hitting a real tennis ball. The All Surface base allows you to play on any surface, simply fill the base with water or sand and you're ready to play. Check out these reasons to buy it. Swingball Pro is taller! Swingball Pro is faster! Has a real Tennis Ball Stronger Power Bats More stable Base For ages 6 years and over. Suitable from 3 Years+ Safety Information: Warning. Not suitable for Children under 3 years.