Wind-Up Robots. Domo arigato Mr. Roboto! Need a dose of futuristic fun? These Wind-Up Robots are sure to fit the bill! Wind these little plastic 2 1/4" robots up to make their heads bob, arms sway and legs walk! Set them loose indoors or out for a fun-filled afternoon. Add these assorted Wind-Up Robots to any space or robot theme birthday party for a surprise that is guaranteed to delight everyone in attendance!