Stepping stones to better coordination, balance, and fun. Each stone has rubber studs on the base which prevent them from slipping, and also protect indoor floor areas. Builds children's confidence when jumping, judging distances, coordinating and balancing. Stackable for easy storage. Set of 6 Riverstones: 3 large stones and 3 small stones. Can withstand weights up to 110 lbs. Grades PreK-3. Ages 3-7.