Discover how a combustion engine works by building your very own working model. Piece together over 100 parts to build an engine with movement and lights. This fantastic engine is a marvellous and fun way to learn all about how an internal combustion engine works. Working model. Includes: 100+ parts. Size H11, W23.5, . Batteries required: 3 x 1.5V (not included). For ages 9 years and over. Manufacturers 2 year guarantee. WARNING(S): Not suitable for children under 3 years old. Only for domestic use.