The Add Stack 6piece STEAM set connects via fully encased magnets and helps support creativity from 6 months to 5 years grows with baby from early stacking to building their own unique design Large 3inch blocks are easy to grasp for younger babies and promote early developmental skills like stacking sorting and cause and effect Reinforces STEAM skills for older children like design engineering and number color recognition with open ended creative building play Includes 4 number blocks Zen the Zebra character attachment and Cal the Caterpillar rattle Highly giftable unisex perfect for floor or table play and does not require batteries Blocks wipe clean Collect all Connectables sets to expand building options and designs as baby grows 76 total pieces across 5 sets