These wine bottle stoppers provide an air-tight seal to prolong and preserve opened bottles of wine.The material is soft and suitable for all bottle types such as wine bottles, beer bottles, soy bottles, vinegar bottles and so on.The stoppers are soft and highly resilient, non-stick, flexible, lightweight and portable. Easy to store and transport.Constructed of durable silicone, the stoppers have a stainless steel core that won't rust, crack nor fade.Dishwasher safe and reusable.