About this item

• Airtight Sealing: ensures secure, leak-proof seals for flasks, test tubes, and condensers during experiments or sample storage
• Wide Size Compatibility: available in multiple sizes (#000 to #12) to fit standard laboratory glassware confirm dimensions before purchase (± 1 mm tolerance)
• Flexible Material: maintains elasticity and sealing integrity over time without hardening, cracking, or deforming
• Laboratory-Only Use: designed exclusively for laboratory use not suitable for food or consumable applications
• Reliable Coverage: 1-year replacement policy for defective or damaged stoppers available in packs of 5 or 10 per size