1.smokeless, no harm to human 2.good quality with competitive ... high-grace raw material, powerful effect against mosquito but no harmful2. Used in the house,hotel,resturant,office,etc. ... more suitable to use the mosquito-repellent incense.3. Smokeless,no offensive odorMosquito Coils:1. Size: 120mm/130mm/140mm2. Burning ... , pls feel free to contact with me anytime! no harm smokeless black mosquito coil