About this item. Material: 100% pine wood. Natural wood structure is Sturdy, Solid and Stackable so it will not splinter into pieces like other cheaply-made rainbow stacker. All the colors are NON-TOXIC and HARMLESS water-based stains. We devoted a lot to color technique, avoiding paint coming off, and guaranteeing kids safety and unlimited joy. Bigger Version: More arches for Bigger Buildings and More possibilities than 6-piece version. With sorting & stacking toys, children can try Easy to Hard basic graphic cognition to creative assembly. Creative open-ended play bring an infinite number of shapes: car, cat, castle, chair, cradle, bridge, barn, flower, horse, maze, people, phone, smile, tunnel...... We bet kids would love and indulge in it. Brain Power: Learning by Playing. Such instructive Montessori toys are particularly tailored for age 2 and up, to make a grab and nurture head-hand-eye coordination. Boost kids creativity, unlock the doors of imagination. Ideal indoor learning activities for babies ages 2-5, as it really provides hours-long focus and fun!. Room Decor: Rainbow building blocks consist of 12 rainbow colored arches, every of which fit correctly together, thereby easy to balance like a typical rainbow and make design with. Vibrant colors and multi use make up the DIY room decor for teen girls&boys, Montessori classroom creation&more. Regretless Gift: Arched stacking blocks toys promote parent-children interaction. Based on Waldorf concept, our toy, with high durability, is a perfect companion for children s growth. Natural wooden grain arouses children s interest to nature, truly away from the quality-insecure wooden toys, while no longer addicted to electronic devices