These versatile white ribbed polypropylene caps are designed for reliable bottle sealing across lab and storage applications. Available in two sizes - 28/410 (1.228" diameter) and 24/410 (1.106" diameter) - these caps feature continuous threading and ribbed sides for enhanced grip and easy handling. Each cap includes a polyethylene foam liner for secure sealing. Manufactured from FDA-compliant polypropylene, these caps can withstand temperatures up to 230° F, making them suitable for various laboratory and storage needs. The continuous thread design ensures a consistent seal, while the ribbed exterior provides excellent grip even with gloved hands. The white color offers a clean, professional appearance ideal for laboratory environments. These caps are compatible with both glass and plastic containers of corresponding thread sizes, offering versatility in your storage solutions.