Build a mechanical eight-legged friend with this all-in-one kit. The multi-jointed legs mimic the walking movement of real spiders! Each set comes with everything kids need to make their own motorized and battery-operated robotic spider, including a 64 plastic parts, a gear box with an on/off switch, 2 battery terminals, a tube, a battery cover and a bonus 23" x 17" color poster. Requires 1 AA battery (not included). Good for ages 8 and up.