The set consist of specimens of 15 different types of materials. Students measure the mass, length and volume to determine the density of each of the materials. Set contains a sturdy storage base with one sample each of Walnut, Pine, Maple, Polypropylene, Polyethylene, Polyamide, Acrylic, Polyurethane, Phenolic, Polyvinylchloride, Delrin, Aluminium, Brass and Copper. Samples are stamped with a letter code for easy identification. Instructions included.