1. It has six metal mesh inside to prevent moxa ash from escaping.With a rubber strap. 2. Easy to use.(Includes steel needle for inserting moxa bar and keeping it steady) 3. Safe(Side hole covered with a lid to control ventilation regarding the exposing hole area) 4. Easy to tidy the box(Closely weaved metal mesh to prevent ash from sifting through) 5. By working on specific acupuncture point with strap banded around, it helps ease the pain and stimulate your vigor.5. By working on specific acupuncture point with strap banded around, it helps ease the pain and stimulate your vigor. 4. Easy to tidy the box(Closely weaved metal mesh to prevent ash from sifting through). 3. Safe(Side hole covered with a lid to control ventilation regarding the exposing hole area). 2. It has six metal mesh inside to prevent moxa ash from escaping.With a rubber strap. 1. Easy to use.(Includes steel needle for inserting moxa bar and keeping it steady).