S.T. Action Pro Inc. .40 Cal 10 Pack Dummy Rounds are created for gun handling, malfunction drills, classroom drills and diagnosis. Developed by dedicated professional law enforcement agents to offer the finest products and training for those who want to improve their firearm handling and skills. Color and design make them visible regardless of terrain. One-piece ABS insert will not compress. The brass case eliminates rim breakage. The rounds are available packs of 5 or 10 units. Will glow brilliantly under black or blue light.