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100% PURE NATURAL OAK: Crafted entirely from premium, high-grade cork oak without chemical binders, toxic additives, or agglomeration; provides exceptional longevity and stops crumbling. TAPERED MINIATURE PROFILE: Engineered with a specialized 11mm to 8mm tapered profile (Size RL1) that naturally compresses and conforms to fit small laboratory test tubes, miniature vials, and sample bottles. READY TO USE (NO SOAKING): Offers superior sealing properties and high cellular flexibility straight out of the box; does not require time-consuming pre-soaking or boiling setups before installation. HERMETIC AIR-TIGHT SHIELD: Provides a dependable, airtight mechanical seal that completely safeguards your liquids against premature oxidation, environmental moisture, and volatile aroma loss. TECHNICAL SPECIFICATIONS: Product Type: Food-Contact Safe Tapered Natural Cork Closure Pack; Upper Diameter: 11mm; Lower Base Diameter: 8mm; Reference Model: RL1; Material: 100% Pure Cork Oak; Pack Quantity: 100 Pieces.