14 Gem Crystal Top Anodized Aluminum Insert Rod, specially designed for perfume and essential oil bottles. Made of high-quality anodized aluminum with luxury crystal top, durable and elegant. Support custom surface treatment (electroplating, spraying, printing, etc.) and crafts (screen printing, hot stamping). 14mm standard caliber, universal for most perfume/essential oil bottles. Wholesale available, made in Wuxi, China.