Specification Brand : OLYCRAFT BulletPoint1 : Package and Size--You will get 12pcs black rubber stoppers, the diameter of the bottom is about 19mm, the diameter of the top is about 14mm, the length is 25mm/0.98 inch and 2.5mm hole. The abundant quantity can meet your various needs BulletPoint2 : Solid Rubber--Made of solid rubber material, with good elasticity, flexibility and sealing, can effectively prevent the leakage of liquids, can be used for small quantities of samples preservation, reaction vessel sealing and other work.Please note that the product is natural rubber, with its own rubber smell, which is a normal phenomenon BulletPoint3 : 1-Hole Design--5mm hole for easy insertion of glass rods, thermometers and other experimental equipment to facilitate stirring, temperature measurement and other operation during the experiment, while maintaining the seal of the container BulletPoint4 : Easy to Use--Easy to insert and remove test tubes, flasks and glass containers, etc. It fits tightly into the mouth of containers, adapts to containers of different calibres and provides a good seal to ensure the accuracy and safety of experiments BulletPoint5 : Wide Applications--Used in all kinds of laboratories, such as sealing test tubes, flasks, conical flasks and other glass containers, to prevent reagents from volatilisation, external impurities into the experimental environment to ensure stability and accuracy Color : White Color ExternallyAssignedProductIdentifier : 9460187222694 ExternallyAssignedProductIdentifier1 : 0641320994152 ExternallyAssignedProductIdentifier2 : 641320994152 GpsrSafetyAttestation : 1 IncludedComponents : 4 Pcs 2-Hole Rubber Stopper ItemName : OLYCRAFT 12Pcs 1-Hole Rubber Stoppers Black Seal Tube Stopper Plug Black Rubber Stoppers with 5mm Hole Tapered Lab Seal Stopper for Test Tube Flasks Glass Containers 1x0.6x0.7 Inch ItemPackageDimensions_Height : 2.5 centimeters ItemPackageDimensions_Length : 10 centimeters ItemPackageDimensions_Width : 10 centimeters ItemPackageQuantity : 1 ItemShape : Conical ItemTypeKeyword : science-lab-rubber-stoppers Manufacturer : OLYCRAFT Material : Rubber ModelName : science-lab-rubber-stoppers ModelNumber : science-lab-rubber-stoppers NumberOfItems : 12 NumberOfPieces : 1 PartNumber : AJEW-WH0460-006B-US13 ProductDescription : OLYCRAFT 1-Hole Rubber Stoppers Made of rubber material Easy to insert and remove test tubes, flasks and glass containers ProductSiteLaunchDate : 2025-03-29T00:00:00.000-07:00 RequiredProductComplianceCertificate : No Size : 18mm Style : Modern SupplierDeclaredDgHzRegulation : not_applicable SupplierDeclaredDgHzRegulation1 : not_applicable SupplierDeclaredDgHzRegulation2 : not_applicable SupplierDeclaredDgHzRegulation3 : not_applicable SupplierDeclaredDgHzRegulation4 : not_applicable SupplierDeclaredDgHzRegulation5 : not_applicable UnitCount : 12 UnspscCode : 52150000