Features: Easy to use and reusable: These car oil diffusers for essential oils have a wooden cap designed to absorb the fragrance slowly and release it over time, ensuring long lasting scent. Reusable. You can conveniently refill your perfume or essential oil after original scent wears off. Chic gift: Be it retirement, graduation, or simple appreciation, these car aromatherapy pendants can be given as gifts to avid aroma lovers, employees, colleagues, teaches, classmates, family, and more, infusing their world with lasting refreshing aura. Specifications: Material: glass and wood lid Color: clear Size: Length: 1.77 inches/ 4.5 cm Width: 0.98 inch/ 2.5 cm Package includes: 20 x Car air freshener hanging bottles Notes: Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays. Do not load inflammable or explosive substances; Do not use open flames in the car; Avoid placing it in a high temperature environment; Check the volatile holes regularly; Do not block the driver's view. Note: Only empty bottles are available, without any perfume or other substances