Weplay Twinkle Stones is a 2-in-1 balance training product which contains Star, Stone and Ball to be used as a set or separately for multiple activities. Both Stone and Star can be placed on either side for different challenging levels to develop body coordination by performing weight-shifting exercises. Ball rolling activity along the Star track could also help children to build muscle control and promote the stability on hands. Star, Stone and Ball could be stored together while not in use. 1. Weplay Twinkle Stones is a 2-in-1 balance training product which can be used as a set or separately. 2. Both the Stars and the Islands can be placed on both sides. Dome side down provides more stability during the game while dome side up increases the difficulties. 3. The imprinted 1 to 5 numbers on the Stone are designed for the Ball rolling activities. 4. The Ball can be stored inside the Stones between uses. Ages 3-8 years.