Young construction workers and architects will spend hours with these lightweight yet durable cardboard building blocks. This 40-piece set features three sizes of “bricks” for constructive imaginative play. Made of premium, extra-thick cardboard for strength, they are easy to assemble and feature a wipe-clean surface. The red blocks hold up to 150 pounds! Our building blocks are lightweight and easy for children to stack. They’re designed with bright and colorful graphics that spark creativity. The Melissa and Doug giant blocks include a step-by-step instruction set for easy fold-together assembly. They also feature a wipe-clean surface for simple clean-up. The Melissa and Doug Deluxe Jumbo Cardboard Blocks are a great gift for kids ages 2 to 5. Add the Melissa and Doug Standard Unit Blocks to round out the pretend play experience and give kids an engaging option for screen-free fun. For more than 30 years, Melissa and Doug has created beautifully designed imagination- and creativity-sparking products that NBC News called “the gold standard in early childhood play.” We design every toy to the highest quality standards, and to nurture minds and hearts. If your child is not inspired, give us a call and we'll make it right. Our phone number is on every product! Gender: unisex.