If you have limited space or want to keep noise to a minimum to keep neighbors happy while still having some pyro fun, then these little shells are the answer. They also give you a much better look at a new star formulation than a star gun since these will put the star up around 100 feet or so which is a lot closer to where you want to view them. They are easy to load, time and put together with a little model glue. I then take three passes of masking tape, once around the equator and then two diagonals and the shell fits a one inch mortar perfectly. THEY DON'T LIKE A HARD BREAK SO DON'T OVER SPIKE THESE SHELLS!