Stackable: The kids stepping stone with LED, When not in use, the stepping stones can be easily stacked together to save spaceAnti Slip : There are non slip texture of this stepping stones, Let the child have better experience when they walk, stand, jump or stepCoordination: Balance Block can exercise children's balance, logical thinking and concentration ability and exploration abilityUnique Design: Stepping stones meet needs of children at different stages of development, which will inspire children jumping, stepping, stacking skills, storage organization habitsIdeal Gift : Crossing river stones are great gift for family and friends. Using as birthday gifts, holiday gifts, classroom educational games, interactive game, kindergarten game Size Chart: round:22cmx22cmx6.5cm/8.66inchx8.66inchx2.56inchLong strip:43cmx11cmx5cm/16.93inchx4.33inchx1.97inch Package Includes: 4 Stepping Stones4Long strip Note: 1. This is not infant toy, please take away from children to avoid eating.2. Please allow slightly errors 1-2cm differences due to manual measurement.