Cube, Individual cubes for density experiments, Available in eight different materials: acrylic, aluminum, brass, copper, nylon, polypropylene, PVC, and steel, Each material is represented by a 1/2inch, 1inch and 11/2inch cube
KidWind Motor Mount Pack, secures a motor to the nacelle, Includes: Two blue plastic motor mounts, Mounting screws and nuts, Recommended for College and High School