For all versions of O'Connell's Dry Herb Therapy Devices purchase 3/4"
5,10, or 20 pack of Stainless Steel or Titanium 100 mesh count (fine) screens. Perfect for this application as it doesn't allow small particles of herb through, which means less frequent cleaning and better air quality.
Pro Tip: These screens can be soaked in Isopropyl Alcohol and rinsed with hot water and used several times.
size: 3/4" and 5/8"