Kansa is primarily a type of bronze with 78% Copper and 22% Tin. Traditionally the metal was made with copper and tin in the proportion of 4:1. Different proportions of copper and tin yield different properties to the metal. Modern bronze alloys also mix other metals such as aluminium, manganese, nickel or zinc and sometimes nonmetals or metalloids such as arsenic, phosphorus or silicon. These additions produce a range of alloys that may be harder than copper alone, or have other useful properties, such as stiffness, ductility, or machinability.