Each Car Diffuser comes with a jute thread on an adjustable wooden bead so you can adjust it to your desired length on your rearview mirror. The small glass vial holds 0.3 oz of your favorite scent. Made with phthalate-free and non-toxic premium fragrance oils. Instructions for use: Unscrew reed lid. Remove plastic plug. Rescrew reed lid and use thread and bead to hang on rearview mirror. Turn bottle upside down and allow fragrance to soak into reed lid. Do not over saturate or reed may leak. Do not allow oils to spill as they may cause damage to certain surfaces. Let bottle hang upright in car and whenever you'd like more scent, repeat step 4!