Specification Brand : DONLAB BulletPoint1 : Top Diameter:67(mm) or 2.638" BulletPoint2 : Bottom Diameter: 57(mm) or 2.244" BulletPoint3 : Length: 35(mm) or 1.378" BulletPoint4 : Composite cork material ItemName : DONLAB PSC-6757 Cork Stoppers, Top Diameter: 67mm, Bottom Diameter: 57mm, Length:35mm(Pack of 10) ItemShape : Round ItemTypeKeyword : science-lab-corks Manufacturer : DONLAB Material : Composite cork NumberOfItems : 10 PartNumber : PSC-6757x10 ProductDescription : Delivery time to the US, CA, AU is 5-14 working days. This series of PSC Cork Stopper are tapered Cork Stoppers that made from agglomerated (composite) natural cork. This product will plug bottles, wine Bottle, lab flask. etc. These corks are different from the US standard cork size. Please measure the size you need before purchasing.