Hammer Power regulator is tailored for those competition shooters who are looking for preciseness hammer/trigger pull feeling or wargame players who are looking for wide-range adoption in different temperature environment. It is made by stainless steel material with CNC machined and high strength spring steel. Every package provides 2 hammer springs (Soft and Hard) and 8 spacers which allow shooters/players to fine-tune its setting in anytime anywhere. Thus, there are 18 different combinations which is able to let shooters/players customise your setting to be perfect. It is suitable for use with Tokyo Marui 1911, and Hi-Capa pistols. Highlighted features Stainless Steel material with CNC machined High-Quality Spring Steel 2 options of spring hardness 8 spacers for fine tuning Enhancing stability and consistency with high durability and reliability Able for an ultimate user to optimise setting and maintain stability *PS: Please note: installing parts / assemble /fitting airsoft gun will need intermediate knowledge; for expert or airsoft gunsmith. Please refer to your airsoft gunsmith for proper installation/fitting. Fitting may be needed as the condition of each airsoft gun might be different. Regular maintenance is needed for all airsoft guns in order to keep it in good working condition and reduce wear out issue on parts. The actual performance is based on the overall setting on your airsoft gun. Please consult your airsoft gunsmith for advising.