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Set includes: 24 pieces of 10ml amber glass bottles with metal balls and black caps; 2 bonus ball inserts and caps; 2 genuine My Oil Key Essential Oil bottle top removers (assorted colors, Made in the USA); Dilutions/Measurements chart; 3 pipettes. Create or dilute essential oil blends and use roller bottles for easy application. Roller bottles have metal balls with black caps. Amber glass helps protect contents. Use My Oil Key (made in USA) bottle opening tool for easy opening and closing of rollers and other essential oil bottles.