The Aerospaced acrylic 3 piece grinder is the grinder we give as a free gift with every vaporizer purchase. This grinder / Storage Case grinds like a typical 2-piece grinder, but the added 3rd piece is the storage case lid, perfect for carrying your blends on-the-go. The Grinder is made from strong acrylic and a powerful magnet keeps it together It also comes in many different colors.