The CCM Half Block Lower Tube Kit includes a heavy weight (40 gram) stainless steel slotted hammer and valve pin with aluminum valve, valve nut and IVG. Springs are also included. It fits half block autococker style markers. CCM products carry a LifeTime Workmanship Warranty. This warranty applies only to the original purchaser and is NON-TRANSFERABLE. This warranty does not apply to items that have been abused, misused, modified or repaired.