The Grippies Shakers building sets are perfect for toddlers to exercise their auditory, fine and gross motor and engineering skills. Connect the two-sized, magnetic rods to each other or combine them with the over moulded metal ball connectors to create a uniquely soothing acoustic building experience. Toddlers can watch the sensory beads rattle their way down the magnetic rods through clear ABS plastic windows. Clean with a damp cloth and mild soap only. Air dry completely.