Conduct experiments and demonstrations for years with the solid and reliable Eisco® brass slotted mass set. This durable, well-constructed set features individual masses that are stamped with markings of 5 g, 10 g, or 20 g. Slotted mass design is easy to use; once added to the hanger, individual masses remain a part of the unit. Set includes two 5-g masses, one 10-g mass, nine 20-g masses, and a hanger and base that totals 50 g. The set has a total mass of 250 g.