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!

• Includes 40 blocks in 3 different sizes
• Made of premium, extra-thick cardboard - red blocks hold up to 150 pounds!
• Bright, colorful graphics on every block
• Includes step-by-step instructions for easy fold-together assembly
• Lightweight and easy for children to lift