Six stacking squares feature hardwood frames, and smooth, rounded corners and edges, with inset magnified acrylic windows. Ideal for exploring natural, tactile, and other detailed materials found inside or in nature. Enhance STEM-based activities with the 6-piece set, perfect for group play. Details: Natural brown Sizes range from 2" to 7" Set of 6 blocks Hardwood block set with inset lenticular windows Each block has 2x magnification, stack blocks together to intensify Ideal for indoor and outdoor STEM activities Rubberwood and plastic For ages 2 to 8