Online at the website.
you can find it at http://www.xpult.com/order.htm
An Xpult catapult works by storing potential energy in its elastic material (such as a rubber band) when it is pulled back or wound up. When released, this potential energy is rapidly converted into kinetic energy, causing the arm to swing forward and launch the projectile. The design of the Xpult allows for adjusting the launch angle and distance by changing the amount of tension on the elastic material.
Depends on each angle