It's a fun way to sharpen problem-solving skills and spatial reasoning while you build Easy to Assembly - Made of premium ABS plastic, our duck building blocks are compatible with major brands. Mechanical Duck Buiding Set - This mechanical duck building blocks set 1168pcs features a movable robotic duck with rotating head and flapping wings, bringing engineering dynamic fun to your building experience STEM Engineer Animal Building Set – This duck construction kit uses gear-driven mechanisms and interlocking parts to show builders how rotary motion transfers through a system. 1168 pieces come with clear step-by-step instructions, making it easy for beginners and experienced builders to assemble in 1-2 hours Perfect Gift for All Ages - Whether for Christmas, birthdays, or holidays, this mechanical duck construction kit makes an creative gift for teens, and adults.