Leak-Proof Design: With the well made stainless steel roller ball and cap, it can prevent any types of leakage. Convenience: Perfect for travel, and conveniently fits in your purse. Suitable for applying diluted essential oils, perfume, blends and other liquids to meet your various needs. Complete Accessories: With the free opener, the roller bottle can be easily disassembled and refilled. This set includes all the necessary tools to make or store essential oils. UV Protection: The glass roller bottle is made of thick glass, smooth and shockproof. The bottles can against UV rays which is harmful to essential oils. Value Set: 12 pack 10ml essential oil roller bottles, 1 extra stainless steel roller balls, 1 extra bottle cap, 30 pieces labels, 1 opener, 2 funnels and 2 droppers.