I've only used plastic grinders I get as free gifts because I'm a fool. I go through maybe 10ish grams a week, and seeing everything left in my plastic grinder is maddening because I can only imagine how much kief I would have. I have no clue, but any amount would be great! I want to order a grinder off amazon asap (idk if the smoke shop will try to sell me something I'll regret) but I have no idea about brands, material, etc. I just know I need a 4 piece grinder, and I personally don't like my herb too finely ground. Also I am on a very tight budget, so I would honestly prefer something that's just decent. But i would like to be informed. Thanks!