Construct tons of fun with these Jumbo Cardboard Blocks 24 pc Building Set! Young builders will love bringing their ideas to life with these heavy duty toy cardboard bricks. Three sizes of durable cardboard blocks are included in this Melissa & Doug's Jumbo Cardboard Blocks construction toy. Made of superior thick cardboard these giant cardboard brick are lightweight yet extremely durable. Young building enthusiasts will spend hours constructing masterpieces with the Jumbo Cardboard Blocks 24 pc Building Set from Educational Toys Planet. One-time adult assembly of the cardboard blocks is required. These jumbo cardboard bricks are really durable and strong. The red block holds up to 150 lbs.!