Product Size: stopper is about 3.8cm Material: silicone Package includes: 6 stoppers ECONOMIC AND PRACTICAL: Set of 6 black vacuum bottle stoppers. The pump removes air from the bottle of wine and the rubber stopper seals the bottle. KEEP WINE FRESH UP TO 10 DAYS: Designed to be used with all Wine Saver pumps. The pump and stoppers work together to remove air from your wine bottle to help keep wine tasting fresh for up to 10 days. DATE TRACKING FEATURE: The vacuum wine bottle stopper allows you to record the date you opened the bottle by simply turning the ring on the stopper. EASY TO USE: Insert the stopper into the bottle neck and pump to remove air until you feel resistance. The less liquid in the bottle, the more pumping is required. Pinch the tip to release air before removing the stopper. VERSATILE COMPATIBILITY: Suitable for all red and white wines. Universal fit for most standard wine bottles.