18 months and up. Children can practice balance as they gain confidence during gross motor activities using the Timber Trail Stepping Logs Set. 16 various pieces can be arranged in endless combinations to create interesting paths and increasingly difficult obstacle courses. Textured logs and stone pieces enhance a child's sensory experience during play. Made from Poly+, this set is durable enough for indoor or outdoor use. Non-slip bases won't scuff floors or move during activities. Straight and Y-shaped pieces measure 19" long, stumps measure 13" x 6", and stones measure 12" x 9".