18 months & up. Introduce young builders to magnetic construction, sensory exploration and social emotional expression with the comprehensive toddler STEM set, Grippies® Shake, Build and Curve. Connect large and small sized magnetic rods to each other or combine them with the overmolded metal ball connectors. The variety of rod styles create a unique structural, rounded and acoustic building experience. Encourage magnetic, auditory and tactile exploration through patterning and 3D construction. This combination Grippies® building set is perfect for toddlers to exercise their auditory, fine and gross motor and engineering skills.