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UNIVERSAL COMPATIBILITY: Fits 20/30 oz thermos cups and various wine bottles, providing a secure seal for straw holes and bottle openings PACKAGE CONTENTS: Set includes 10 grey silicone grommets, offering excellent value and spare replacements when needed SECURE SEAL: Premium silicone construction creates an airtight seal to prevent spills and maintain beverage temperature EASY INSTALLATION: Flexible silicone material allows for simple insertion and removal while maintaining a snug fit VERSATILE USE: Perfect for thermos cups, wine bottles, and various beverage containers requiring a sealed straw opening or stopper