GREENGUARD® Gold certified. These 20 and 40 piece hollow block sets contain (7) assorted shapes in a variety of sizes so children can let their imaginations run wild. Constructed from 100% Plywood, and coated with our exclusive Tuff-Gloss™ UV finish. Fully rounded corners and edges for maximum safety. Fully Assembled. Comes in 20 and 40 piece sets. 10 year warranty. Made in the U.S.A.