Build your own 75mm (3") tall desktop trebuchet.Is your desk is missing that certain something to show of your geek cred? Do you need to launch little wooden projectiles into the next cubicle? Do you want something "sciency" to do with your kids? You can now do all that with your very own desktop siege engine.This kit has (almost) everything you need to build a working desktop trebuchet. You will need to provide some wood glue, a patch of cloth and a sewing needle, thread and a little ballast. Takes about 30-60 minutes to assemble.See a 19 step photo filled instruction instravaganza on Instructables: http://www.instructables.com/id/Make-a-desktop-trebuchet/