mini Cannon : Siege Engine Engineering Kit Do you need to invade a dragon's secret lair? Introducing the mini cannon, a handy engineering kit perfect for your siege equipment needs. Learn about engineering simple machines with this STEM building kit. Once built, you can launch mini projectiles and fend off those clever beasts. A bombard, also known as a cannon, was large and heavy and required a crew to operate, but this historical replica has shrunk down to a mini size. Da Vinci, the ultimate Renaissance man, was a skilled artist, engineer, and military mastermind. Hands-on learning at its best. Building models decreases stress, increases focus, organization, spatial and fine motor skills. A great gift that will bring all ages together for a project.