Perfect for density experiments, use this set determine the mass and volume of each sample and graph the mass versus volume. The slope of the straight line that results is the density of the material. Includes 12 pieces each, cut to different lengths, of PCV, brass, aluminum, and polypropylene. Comes in an attractive wooden holder, which allows for efficient storage and easy access when needed. It also allows the teacher to see immediately that all samples have been returned. Includes instructions. Set of 48.