10ml Elegant Frosted Glass Roll On Bottles with Perfect Stainless Steel Roller Ball & Brushed Aluminum Cap ? These metal balls have a perfect tight fit that won't ever leak. With the bottle inverted, the weight of the steel ball creates a seal preventing oil release. A quick shake allows the release of the oil for a smooth and even application every time ? The durable brushed stainless steel cap screws on securely and protects your essential oils while maintaining an elegant look and feel ? Certain oils & chemicals do not interact well with cheap plastic balls and possibly ruin the rolling mechanism. Stainless steel roller balls do not erode and will continue to roll on smoothly every time ? Our luxurious glass bottles are not painted and will not scratch easily ? Elegant cobalt blue frosted bottles have a deep rich and dark color to prevent light damage to sensitive oils. BPA Free Roller Seat with Metal Ball Prevents Leaks and Provides Even Application Every Time. Enjoy the Convience of Making Your Own Powerful Natural Essential Oils Blends. Enter discount code at check out to receive between 10% and 50% off. Remember that there are small parts if taken apart. Keep out of reach of children of those who would put things into their mouths. These bottles are made of glass. Take proper precautions with glass so that it doesn't break and if it does use gloves when cleaning up. Use only high quality Certified Pure Therapeutic Grade Essential oils in this roller bottle.