Features: Durable: This beer bottle cap is made of food grade PPmaterial, and will not pose a threat to your health. Automatic opening/closing of beer bottle cap designs: Place it on the beer bottle and it will automatically close. Pick up the bottle to drinks, it will automatically open. Reusable: Remove when not in use. Simply stores it after cleaning and you can take it out when needed . Dust prevention: When you stop drinking, dust may seep into beer bottles, and this type of beer bottle cap can become an effective tool to solve this problem. The automatic beer cap designs is suitable for most standard beer beverage glass bottles. The automatic bottle cap forms a tight and seal on the bottle, preventing carbonation and leakage, ensuring that your beers remain freshs and deliciously. Specifications: Material: PPMaterial Style: Single Red/Single Yellow/Single Green/Single Black/Single Blue/5 Pcs/10 Pcs Size: As shown in the picture Package Includes: 1/5/10pcs Beer Bottle Cap note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.