30 joules of power! ***disclaimer this is for STOCK markers that are co2 powered… THIS WILL NOT GIVE ANY POWER GAINS TO A MARKER RUNNING HPA This spring allows you to crank up the juice and get maximum power out of your TipX launcher! This boosted the power from 300 FPS to a whopping 450 FPS while using 3.0 gram polymer kinetic rounds. And when using 7.3 gram aluminum balls we were able to achieve 37.9 Joules �� This spring replaces the stock valve spring in the PRV which normally only allows for 300 FPS or around 13 joules and then has a safety blow of feature. This upgraded spring bypasses the blow off feature and allows you to get full power from your marker! After doing this mod we do not recommend using paintballs. This is great for heavier kinetic rounds like solid aluminum or steel. Perfect for Less-Lethal home defense! Grab a spring today and turn your paintball marker into a serious home defense tool! Also note after doing this mod you will only get about 10 really powerful shots when cranked all the way up. We have noticed you can turn the power down, if you go one full turn from full power but if you turn it too low it will start to leak. The lowest setting after doing this mod is around 16 joules which would still be too much for paintballs but may still work with certain powder projectiles.