The Essential oil glass bottle is made of corrosion-resistant glass which makes it thick, smooth and shockproof. The oil bottle protects essential oil against harmful UV rays to save it from quick volatilization. Stainless Steel Roll Balls The roll balls are made of Stainless steel, which is corrosion resistant and well-made. The tightness prevents any sort of leakage. We adhere to the principle of providing customers with the best skin care experience, providing customers with square; Round essential oil packaging bottle, all standard refined oil bottle screw is 18-410, generally only transparent and brown, refined oil bottle is generally matched with a plastic head dropper, anodized aluminum ring or plastic ring other colors can also be customized. Available with child safety cover. The Boston bottle is also a type of fine oil bottle, but the Boston bottle has three threads, while the fine oil bottle has two threads.You can also design your essential oil formulations with these adorable bottles to would help you to relax during salon or aromatherapy.