5x11mm ball bearings (4)

and an overall Gear Ratio of 1:81

these tyres will fit standard 2

Two AA batteries are required (sold separately)

Make Bug - MakeBug Voices of Nature, Robin Servos Standard 5x11mm ball bearings (4)Real Robin Sounds: This toy records real robin calls and is composed of 41 beautifully printed puzzle pieces, allowing you to assemble a lifelike bird model. A gentle touch triggers delightful bird songs that inspire curiosity to explore the robin's characteristics, habitat and behavior. Gift for Tweens, Teens: The bird is mainly composed of 41 smooth cut cardboard accessories, combined with the innovative design of animal toy models and sound horns