Made of hardwood frames with acrylic mirror. Features clear plexi windows. Comes with 8 blocks per package. 4 rectangle and 4 half moon shapes. Features plexi inner with colored sand. Recommended for children 3 and up. Sized to standard unit block measurements. About GuidecraftGuidecraft was founded in 1964 in a small woodshop, producing 10 items. Today, Guidecraft's line includes over 160 educational toys and furnishings. The company's size has changed, but their mission remains the same; stay true to the tradition of smart, beautifully crafted wood products, which allow children's minds and imaginations room to truly wonder and grow. Guidecraft plans to continue far into the future with what they do best, while always giving their loyal customers what they have come to expect: expert quality, excellent service, and an ever-growing collection of creativity-inspiring products for children.