Magnetic Herb Grinder: Tobacco Grinder with clear press button Magnetic Herb Grinders, Tobacco Grinder1. The metal Grinder is made of CNC technique from a wohle part ... of 40/42/50/55/62/76/89/101mm.3. Grinder's Color: silver, grey, red, green, blue, etc.4. Customized ... logo: can engrave/print your logo on the grinder.5. Grinder's Material: Aluminum or Plastic.