NUPROL 4.0 Ultimate Power Gas – Black is a high-performance gas for rifles and IPSC, designed to operate at lower temperatures (between 3c – 20c) allowing you to use your weapon all year round. Using this high power mix gives an increase in FPS, GBB efficiency, and a harder kick. Each bottle is constructed from strong Alloy and contains 300g (1L) of pressurised gas. The nozzle is long and is constructed from Metal, giving a better fit into gas valves on your magazines. Recommended for use in ALL WE EUROPE Rifles.