Design and build your own battery-less buggy with this Pull Back Motor, Axle and Wheels Kit from Kitronik. Create a custom chassis, attach the kit which includes a pull-back motor with a drive axle, a front axle, and four wheels. Pull it backwards, release, and the buggy will move forward powered by the stored elastic potential energy in the motor's spring.This kit is a great educational tool for younger design students and physics/science lessons to explore potential and kinetic energy. Hours of fun to design, assemble, and decorate your own buggy chassis. Pull-back motor, drive axle, and wheels kit included Design your own custom chassis Excellent for teaching design and energy concepts No batteries required Assembly instructions provided Contents: 1 x Pull back motor with attached axle 1 x Front axle 4 x Wheels Dimensions: Length: 28.4 mm (24.7 mm excluding front and rear lips) Width: 11.8 mm Height: 15.2 mm (highest point) Axle length: 45 mm Axle diameter: 2 mm Download assembly instructions and build resources are available on the product page.