First time using this product in my classroom was a game changer for me! Having a training aid such as these that look and feel like the real thing! and with the many different variations of sights i was able to show my students that had different types of sights like the u notch or XS big dot exactly what they need to see! Gun training sights allowed my students to comprehend sight alignment and sight picture much quicker then ever before! I got that warm fuzzy feeling all over when I realized just what a difference it had made for me and my students! problem solved! I highly recommend you give them a try!