Engineered Reed Sticks –the sticks are made to seep the fragrance oil effectively and disperses the aroma in consistent uniform quantities compared to bamboo/rattan sticks where it clogs the scent from diffusing. E Reed sticks last for more than 1 month, and should be replaced when dirty or when changing scents. *Available in black and white colors *16 pcs per package *Recommended use of 4 sticks per E Reed Diffuser