Material: glass, wood, metal, plastic Size: bottom width 2.7 cm, height 7.4 cm Packages: 2 pieces The cap is made with wood for great durability but breathable enough to release just the right amount of aroma to fill your car or room You can either decorate your car with it or use it as a diffuser. Use your favorite essential oils to enjoy a wonderful journey, relieve stress, relieve fatigue, and refresh the air You can either decorate your car with it or use it as a diffuser. Use your favorite essential oils to enjoy a wonderful journey, relieve stress, relieve fatigue, and refresh the air