Product Description Gorilla Blocks Extra Large Building Blocks promote creativity, logic and reasoning skills for children of all ages. These blocks interlock securely and encourage children to work and communicate together, while also helping children develop motor skills and hand-eye coordination. This foam evolved from automotive safety applications, and is extremely durable, non-toxic, weatherproof and recyclable. This 66-piece set of Gorilla Blocks Extra Large Building Blocks comes in assorted colors and sizes, and is perfect for the classroom and the playroom at home. Gorilla Blocks let children’s imaginations shine! From the Manufacturer These inter-locking building blocks promote the development of Creativity, Logic and Reasoning skills. These blocks provide intellectual stimulation through the development of Math, Science, Motor Skill Function and Hand/Eye Coordination. Gorilla Blocks are lightweight, energy absorbing, extremely durable, non-toxic, weatherproof and recyclable.