Premium 15ml wide mouth glass test tubes crafted from high-borosilicate glass for superior heat resistance and chemical stability. Leak-proof threaded cap design ensures secure storage for liquids, powders, and delicate materials. Ideal for premium tea packaging, spice storage, cosmetic samples, and laboratory use. Crystal-clear transparency showcases contents while maintaining product freshness. Bulk packaging available for commercial buyers with wholesale pricing advantages. Features uniform wall thickness and flame-polished edges for professional handling. Stackable design optimizes shelf space in retail or production environments. Complies with international food-grade safety standards for direct contact applications.