Check the listing for details. 2.2" UFO Spice Herb Tobacco Grinder Herbal Metal Smoke 4 Piece Crusher Gift. Condition: New. Listed at 19.99 USD. Material: High Grade Zinc Alloy. Of course, things don't always go as planned. Product Specifications .Material: High Grade Zinc Alloy. Of course, things don't always go as planned. Product Specifications .