The NEW SLX version 2.0 four piece grinders are all FULLY coated with our exclusive non-stick ceramic coating that never needs cleaning. Our 2.4" model is the perfect size for daily use - this is the standard size most consumers are looking for when they purchase a grinder. The unique screen design eliminates threads. The screen easily drops into place in the bottom section and screws securely to the 2nd stage. Without the screen the bottom stage stores 2 grams. The coating is extremely durable.