I have a mix of steel and polymer moon clips for my S&W 625. The steel are sturdy and pretty hard to get the empty hulls out of but the polymer are just the opposite, very easy to load with rounds and to remove hulls. I got them for use at the range but would certainly not want to bet my life on them in a gunfight. They are called RIMZ and sold by Beckham Product Design - Ez Moon Clips.