1.Compatible with 28SP-400 neck finish for secure closures. 2.Multiple configurations, including options with tamper-evident rings, desiccants, or plug liners. 3.Made from premium PP resin for durability and chemical resistance. 4.Available in a broad color range including white, purple, green, blue, orange, and black for branding flexibility. 5.Precision inner and outer dimensions ensure a snug fit. 6.Suitable for pharmaceuticals, food, beverages, and consumer goods.