Pulleys Plus, a 12-piece accessory set for Gears! Gears! Gears!, supercharges the creative possibilities of any Gears! creations. The set contains a fascinating worm gear, which meshes perfectly with any of the other gears, an extra crank handle, four sizes of ingenious pulleys–the largest is just under 2.5 inches–which slip easily onto both gears and bases; and two giant rubber bands for the pulleys. Budding engineers will discover how conveyor belts function and how some engine and clock parts work. Who knows? Your little builders might develop the world’s first automated sibling transport system. Compatible with both Wacky Factory and the Gears! Gears! Gears! Basic Building Set. Note: because Pulleys Plus is an accessory kit, another set of Gears! Gears! Gears! gear is necessary. –Julie Ubben