It was made by high quality spring steel. Its special design is able to supply an addition tension during cycling and enhance the durability. It can make sure the nozzle movement stable and workable. It provide 145% power during cycling. It is designed for TM M&P9L.

COWCOW Technology 145% Nozzle Spring for Tokyo Marui M&P9 GBB
Improved spring over the stock nozzle spring.
145% nozzle
Suitable for Tokyo Marui M&P 9 Series Airsoft Gaas Blow Back GBB Pistol