Reed diffusers do not require any heat to release the fragrance into the air. They absorb the fragrance directly from the oil they are in without the need of any flame from a candle, making them much safer to use than a simmer pot or tart warmer. They will last for months before needing to be replaced. These are genuine 12" "reeds" and not made from bamboo.
Diffuser reeds work best with a fragrance oil that has a good cold scent throw.