Size: stopper is about 3.8CM Material: silicone Package include: 6*stoppers 1.ECONOMICAL AND PRACTICAL: The set 6 black vacuum bottle stoppers .Pump removes air from the bottle of wine, and the rubber stopper seals the bottle. 2. PRESERVE WINE FOR UP TO 10 DAYS:Designed to be used with all of Wine Saver Pumps. The pump and stoppers are used together to remove air from your wine bottle to keep wine tasting new for up to 10 DAYs 3.TIME SCALLE RECORD: The vacuum wine bottle stopper can record the date you last opened the bottle by simply turning the ring on the stopper. 4. EASY TO USE: Insert the stopper into the bottle neck and pump to remove the air until you feel resistance, less liquid in the bottle, the more you will need to pump.Pinch the tip to blow off air before removing the stopper. 5.Apply toSuitable for all Red and White Wines. Universal fit for all wine bottles.