The Rainbow stacker is an amazing open ended toy thats great for kids of all ages and now we added half circles to the set to have ability to create even more. This building set is different from the typical puzzle because it is an open ended toy. there are hundreds of ways to stack it and play with it. It can be used to practice balancing skills, or designing patterns in a more typical environment, but is great to incorporate into open ended pretend play. The rainbow can become a fantasy castle, a track for cars, a mystical maze, a hilly play field, or anything that your little one can imagine and now with building plates your child can create even more. It makes a great gift for children, and can be a great replacement for a wooden blocks set. This type is typically seen in a Waldorf or Montessori style education setting, but will also go great in a homeschooling environment. Our rainbows are of the highest quality made from Poplar hardwood. We hand cut each rainbow to order and sand them to perfection. After the initial sanding we stain them with AP Certified, Non-Toxic wood dye, and get a second sanding. finally we rub them with our home made wood polish which is made from organic coconut oil and beeswax. we then pack them securely and send them to you for your little ones to enjoy. Half circles are made from non toxic 1/4" thick birch plywood, sanded, stained, sanded again and rubbed with Beeswax and coconut oil polish. Please note as this item is dyed, the wood grain shows through and due to grain and wood variation, the colors may differ from the pictured rainbow. In addition with any dye if the rainbow gets wet you may see some color transfer. The dye is AP certified non toxic. If this toy is going to be used for a child that puts items in their mouths, we strongly recommend to purchase our unpainted or unstained version of this rainbow. Dimensions or rainbow are 10 long, 5"tall and 2.25" thick Dimensions for half circles are made to fit the rainbow.