neon butterfly em1 silver chrome 56mm aluminum magnetic metal herb grinder 4 piece hand muller spices & herb heavy duty 2.2" sandpipper you are buying a 4 piece aluminum metal grinder. the images have been protected with crystal clear laminate coating, for long time duration! there are 26 sharp teeth in the main grinding chamber. the magnetic grinding compartment includes a stainless steel micro mesh screen that collects pollen as you grind. this product is simple and easy to use: 1. place herb or spice onto the teeth toward the outside rim. 2. close and rotate the lid about 5 times in each direction. 3. gently tap to remove the ground material 4. fine material will begin to collect on the bottom after just a few uses!