About Guidecraft Guidecraft 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. Made of birch plywood. Blocks are sealed and finished inside and outside. Comes with 16 piece set. Edges are rounded and surfaces are sanded smooth. Recommended for children age 3 and up. Sized to standard unit block measurements.