These heat shrink capsules are made of flexible and durable PVC material, and good heat conductivity provides a tight seal when heated. The wine stoppers are made from cork material, ensuring a secure fit and durability. The wine bottle sealer shrinks down to fit snugly over wine bottles or glass rims when heated, providing an airtight seal to preserve the wine's quality. First, simply press the wine stoppers into the bottle opening until secure, then slide the heat shrink capsules onto the bottleneck and apply heat evenly using a heat gun, hairdryer, or steam for shrinking to form a tight seal. The heat wine bottle caps are suitable for various glass bottles: ice wine bottles, red wine bottles, beer bottles, and fruit wine bottles. Also can be used for olive oil bottles, condiment bottles, and more. Good for bars, parties, picnics, wine cellars, homes, kitchens, etc. When applying heat to the PVC capsules, ensure to do so in a well-ventilated area and avoid direct contact with the heat source to prevent burns or accidents. Material: PVC Color: Black Total Size: 30 x 60 mm/1.2 x 2.4 inch(Dia. * H) Wine Stopper Size: 19 x 28 mm/0.7 x 1.1 inch(Dia. * H) Wine Stopper Outer Size: 29 mm/1.15 inch 100Pcs x PVC Heat Shrink Capsules 12Pcs x Wine Stopper