There are many different types of materials used for weed grinders, and have different benefits. A plastic weed grinder is light and compact, but can break if not careful. Anodized aluminum is very popular for weed grinders, due to the strength, ease of use, and reliability.
There are many types of weed grinders. In most cases you’ll find that a weed grinder comes with different parts, or compartments. A 5 part weed grinder would come with a lid, storage, grinding chamber and multiple kief screens. A standard 2 part weed grinder would only grind your weed.