This kit contains all you need to build a working DC motor and learn its parts from the inside out! Wind your own armature and field coil; build the commutator with two snap-together pieces. It's a device that's been used for over 40 years to teach crucial concepts. Includes: 2 copper wire coils; plastic base; field poles; armature core; brushes; fasteners. Ages 10 up. Also, in bulk with enough parts for an entire class, 2 students per one set of instructions.