The Next Step in Erector Sets! -- New flexible metal pieces make more realistic models with new mechanisms for enhanced movement. -- This design kit builds five models including a helicopter, motorbike and go-cart. The set"s flexible metal pieces spring back to their original shape for easier assembly and more versatile designs. -- Building with Erector Set Design 2 will improve mechanical skills, sequential thinking, and hand-eye coordination. -- The set includes 223 parts and tools. -- For Ages 8-15.