Our 20 teeth roller ball holder is plastic inner support insert, matching for cosmetic roll-on bottles and essential oil roll-on containers. Made of high-quality plastic material, this roller ball holder features stable structure, precise thread size for 20-teeth bottle neck. It can firmly fix the roller ball, ensure smooth rolling during application and prevent ball dropping. Perfectly fitted for roller ball assembly, easy to combine with roller ball and outer cap. Multiple color options are available, custom color is supported. Widely used for essential oil, perfume, aromatherapy and skincare roll-on bottles. Direct factory supply, flexible MOQ for cosmetic brands, traders and cross-border sellers.