These are grinders for weed and other herbs, and are all made of either acrylic or an equally strong and more environmentally friendly hemp plastic. These grinders tend to be cheaper and only comprised of 2 pieces, a stop and a bottom. These hemp and acrylic grinders work best in union with a rolling tray or a surface to dump onto, as there is no storage area. We have all sorts of different hemp and acrylic grinders, so shop some of the most affordable and highest quality grinders today!