Set Includes: (1) 5 Kg slotted mass, (2) 2 Kg slotted masses, (1) 1 Kg Slotted Mass, (1) 0.5 Kg Mass Hanger Entire Mass Set, including hanger is made of cast iron Masses are slotted to fit the hanger that comes with the set Built for decades of use Total weight of set is 10.5 Kg This mass set is prefect for when a large load is required, such as a Sonometer, stage apparatus, boat, or in a shop. The five piece set contains: (1) 5 Kg slotted mass, (2) 2 Kg slotted masses, (1) 1 Kg Slotted Mass, (1) 0.5 Kg Mass Hanger