20 Bonsai Tools are made of stainless steel.
SUS420 steel is suitable for applications of a wide variety of precision machinery, tools, bearings, mechanical instruments, etc. In most cases it is used to manufacture components that are resistant to air corrosion, vapour and water.
Although it is a stainless steel, it is recommended to clean the tools after use and oil them regularly, this will prevent the appearance of surface stains, which although do not affect the functionality of the tool, promote premature ageing of the tool.