This slide kit includes a 17-4 PH stainless steel striker, 9mm extractor, extractor depressor, striker safety, 6061-T6 aluminum cover plate, stainless steel 5.5lb striker spring, extractor depressor plunger spring, striker safety spring, striker channel liner, striker spacer sleeve, striker spring cups(2), and extractor depressor plunger bearing. This kit is compatible with 9mm PF-Series and Glock Gen 1-4 slides.