BEST SELLER ALERT!! Each bottle holds 8ml of fragrance oil Long Lasting fragrance ALL diffusers will be packed in a smell proof bag with the names/scents on the bottles & packaged individually!! Packaging MAY VARY!! Please take into account that these are OILS!! In your car they will heat up, DO NOT let oils drip/leak inside of your vehicle as hot oils = melting hazard for any type of plastics!! If diffusers get to hot please remove them from your vehicle! I am NOT responsible for damages due to direction negligence! Steps; 1.) Remove wooden cap 2.) Take plastic stopper out 3.) Put the wooden cap back on, hang upside down for 2-4 seconds or until lid is saturated 4.) Replace plastic stopper 5.) Hang in the desired area… and enjoy:) Testers will come in an identical bottle but will hold 4.8ml of fragrance oil!