Enjoy a new expression of a familiar winter fixture: holly leaves infused with the bracing scent of fir An individually packaged HA KO leaf is the perfect introduction to this new form of incense, which was developed over the course of five years by one of Japan's oldest incense makers. Winner of the 2019 Good Design Award. How to use: After lighting a piece of HA KO Paper Incense, blow out the flame and place the smoldering leaf on a felt burner mat (sold separately), which should itself be on a flat, non-flammable surface. Each leaf will burn for approximately 5 - 7 minutes.