These roll-on oil bottles feature a cylindrical design crafted from bamboo, metal, and glass, available in 3ml, 5ml, and 10ml sizes. Produced in Mainland China, they come with eco-friendly bamboo caps and packaging, offering a sustainable option for creating personalized essential oil blends. The refillable bottles ensure minimal waste and are compatible with popular brands like DoTerra and Young Living. For best results, avoid using essential oils diluted above 10% and test blends carefully, as some oils may degrade plastic components. Note that fractionated coconut oil is not recommended with the stainless steel rollers.