Jumbo Blocks are proudly made in the U.S.A with durable Polypropylene washable plastic material. The oversized and interlocking blocks have smooth round edges for safe for endless play possibilities. Our Blocks are made with our unique plastic that allows children to draw directly on the blocks with the Non-Toxic washable markers. Easy clean up just wipe off with a clean wet towel for continuous creativite play. The Giant Blocks included are (8"x4") and a variety of colors (Red,Green,Blue and Yellow). Colors may vary