This wooden machine is elegantly designed and easy for students to use Study how changing the distance from the fulcrum changes the mechanical advantage Students can intuatively figure out the balance point for a given set of masses Includes an instruction manual to fasciliate student and teacher use of the apparatus Made of particle board and wooden components. 8 5/8″ by 2 1/4 ” base with 5 1/4″ height. Lever arm is 17 3/4″ long.