The kit includes our famous striker safety lever, to remove the long trigger pre-travel on the XD trigger. Reduced power trigger and sear springs, to lower the pull weight. Our new sear that has a patented angle to help lighten the pull and give a smooth crisp break and our new trigger. The trigger is made of tough, light weight polymer that helps speed up the reset. It also has an integral over travel stop on the back of the trigger. Using this method of over travel stop removes added stress on the trigger bar that are present with any of the other over travel stop method. When installed correctly, the kit will give you a short crisp trigger pull (about 3.5-4lbs) with a fast reset and cut the total trigger pull length by about 1/2. The kit requires minor fitting and includes gunsmith installation instructions. Fits all XD models (EXCEPT the XD 45 thumb safety model).