These jumbo interlocking blocks made of Expanded Poly Propylene high-density foam are resilient, durable and lightweight with a textured surface and rounded corners to allow younger children to build as large as their imagination. The 66 pc. set comes in 3 sizes and 4 colors with a nylon mesh bag for storage. Gorilla Blocks™ also float in water and the colors won't rub off on clothes or skin and won't fade in the sun making them the perfect building toy inside or out. The largest block measures 10½" L. x 3½" W. x 3" H. Ages 3 yrs. +. Sorry, no gift wrap or express delivery.