Includes teacher info booklet with lesson plans and ideas plus a 15 page student handbook with info about the history of hydraulics machines. Teachers need only scissors, glue and cardboard to get their class inventing with parts for 30 students in pairs to build over 15 machines with an average of 4 pistons per machine. All pieces are pre-cut and pre-drilled for easy and very sturdy construction. Suitable for beginner model makers. Precisely cut and ready to assemble with timber slot construction. Has an excellent, easy to read and understand building manual with clear illustrations.