The new 2.4-inch charcoal gray SLX grinders version 2.0 are coated on the inside and outside with a non-stick ceramic coating, which was developed from materials that reduce the friction on industrial blades and cutting tools. SLX grinders do not need cleaning, but if your herbs are exceptionally high in moisture (more than 12%) or you are using an exceptionally high amount, light scale may build up. The coating is bonded to the aluminum on a molecular level, 100% non-toxic, FDA approved and does not burn. The 2.4 inch model is the standard size of 62 mm. Perfectly made from 7075-T6 aluminum, a lightweight metal that is one of the toughest and most durable types. The handles are cut on the outside so that you can always turn easily. The trapezoidal teeth grind your herbs to the perfect consistency. The 4-part design is magnetic and has a stainless steel strainer that catches your flower and can be lifted directly up to collect the pollen on the part below.