These versatile silicone stoppers are easy to use and maintain. Simply insert them into the bottle opening to create a tight seal. They are compatible with a variety of bottle types and can be used for beverages, oils, or other liquids. Features -Color:White -Material:Silicone -Size:3.30X3.30X1.35cm/1.30X1.30X0.53in -Size:3.30X3.30X1.50cm/1.30X1.30X0.59in -Size:2.80X2.80X1.40cm/1.10X1.10X0.55in -Size:2.50X2.50X1.40cm/0.98X0.98X0.55in -Size:1.70X1.70X1.20cm/0.67X0.67X0.47in -Size:1.50X1.50X1.20cm/0.59X0.59X0.47in -Multisize fit: compatible with 10.5/13/16.5/19/22/25 mm bottle openings, offering flexibility for different sealing needs -Reliable sealing: made from silicone, providing a tight seal to prevent evaporation and contamination -Temperature versatility: suitable for a wide range of temperatures, ensuring consistent sample conditions -Reusable: reusable and easy to clean, promoting convenient lab practices -Wide usage: Ideal for use as waterproof plugs, sealing stoppers, test tube caps, rubber bulkheads, and cylinder plugs Package list: 30 x Bottle Stopper Seal Plug