Ideal for sealing bottles, these silicone plugs are waterproof and reusable, ensuring longterm performance. Their round design fits snugly into bottle openings, preserving the freshness of liquids. Ideal for glass bottles, water bottles, and other containers, they are a practical sealing solution. 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 -Versatile compatibility: designed to fit multiple bottle sizes, making it a versatile choice for various lab applications -Durable silicone material: provides a secure seal, preventing leaks and protecting against impurities -Wide temperature range: performs well in extreme temperatures, from freezing to high heat, ensuring sample integrity -Reusable: reusable design helps supports convenient and practical lab operations -Multiple applications: ideal for use as waterproof stoppers, sealing plugs, test tube caps, rubber bulkheads, and more Package list: 30 x Bottle Stopper Seal Plug