These blocks are not as sturdy as the brand name blocks, but you would not want them to be as thick and heavy as that at this size. They are light and easy to put together, colorful, and fun. My kids make forts, chairs that they can sit on, walls for Nerf battles... My kids are 11 and 9 and can sit on a "throne" they made." These hold up well and are hours of creative fun, plus brighten my son's room. Lots of fun!