As marijuana becomes legal for medicinal and recreational purposes around the United States it is becoming increasingly important to find the best weed grinder for your smoking needs. The truth about herb grinders is that they are not all created equal and you have to be careful to ensure you get the best grinder that will last and is safe to use. Cheap grinders that are made out of acrylic are generally not a good choice because they fall apart and you risk the pieces falling into your herb. Many of the best marijuana grinders are made from zinc alloy or lighter weight aluminum.