3 years & up. Develop fine and gross motor skills, patterning, shape recognition while building with this Panelcraft® set. Make large structures, towers, play houses and more. Made from durable, non-toxic materials. Panels and windows measure 9" x 9" each. Inspired by the colors of earth, the set includes 11 solid panels in in sky blue, forest green, sand, brown and slate colors with 8 white windows, and STEM activity guide.