Not Rust: This wine stopper is made of zinc alloy and silicone, sturdy and stylish. It is not affected by red wine acids and alkalis, and will durable and not rust. 6 Pcs in a Set: Silver*2pcs(without hole), gold*2pcs(perforated), bronze*2pcs(perforated); The reusable wine bottle corks size is 6.2 cm / 2.44 inch. Each pack contains 6 wine stoppers. How to Use: You just need to put the stopper into the bottle, suitable for bottles with a neck diameter of 15-20 mm. Features: Makes the wine bottle sealed and leak-proof, protect the inside of the product, protect the product from harmful contaminants. Keeps it Fresh: Cork has a good seal, perfect for preventing air leakage and keeping wine, champagne and other carbonated beverages fresh. Corks are great for sealing wine, champagne, soda, oil, beer and vinegar bottles.