Howdy guys. I recently bought a new shotgun and was going to grab some chokes for it. The gun is a supposed to be a do-it-all kind of gun and so I wanted to get chokes capable of handling any type of shot. The chokes are for a Remington 870 super mag. I've really only looked at a few types of chokes, but none of them list exactly what type of steel they are made of or what hardness you need to handle high velocity steel shot loads. I was probably going to get a set of three; my main desires being non-ported chokes (for ease of cleaning), and the ability to handle large and high velocity steel shotgun loads. Extended or flush mount are fine, as long as they are tough as nails and non-ported. Any help is appreciated. Thank you for your time. -Ben