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Pack of 10 to meet the airtight sealing needs of various types of laboratory vessels; contains #5 size stoppers (0.87" bottom × 1.14" top × 1.10" height) Engineered to maintain elasticity and sealing integrity through repeated laboratory use, ensuring long-term airtight seals for glassware Available in standardized sizes for diverse glassware joints; please confirm measurements pre-purchase to guarantee proper fit with lab equipment (±1mm measurement error) Exclusively formulated for laboratory environments, not rated for food contact 1-year coverage period for your peace of mind, if received damaged, please let us know and we will solve it promptly