Gorilla Blocks® Extra Large Building Blocks, Assorted Colors, 3-1/2" x 3-1/2" to 3-1/2" x 10-3/4", 66 PiecesThese extra large building blocks promote creativity, logic and reasoning skills as well as developing motor skills and hand eye coordination. Blocks interlock securely and encourage children to work and communicate together. Gorilla Blocks foam evolved from automotive safety applications, and is extremely durable, non toxic, weatherproof and recyclable. Set includes 66 pieces in assorted sizes and colors. The entire set weighs only 8 lbs., but each