These are some nice grinders, they are manual which I actually prefer because that is one less thing to have to buy batteries for. The grinders grind the salt and pepper very well. They are made of glass and stainless steel, the grinders are light weight and easy to use and fill. We use ours we different spices, since we don't use salt very much. I believe you get a fresher taste with fresh grinded pepper and other herbs, than just using the store bought kind already done. These also came with a bonus set of shakers they are made out of glass and stainless steel as well. I really like the quality of this set.