wine stoppers is made of ABS materials, help preserve the wine's flavor and keep the wine tasting Wine vacuum stopper have numbers and dates on top which can record the time you last opened.Vacuum Wine Pump Preserver is the smart way to save unfinished wine for later. The vacuum rubber seal fits most wine bottles as well as others with similar characteristics. It preserves the cork and prolongs the wine freshness. Just insert the stainless steel vacuum stopper into the wine bottle and pump it several times to seal the bottle air tight, Fits most wine and champagne bottles.it's vacuumed perfectly and easy to use for wine preserver. Material: ABS colour: black Package Contents: 2 x Champagne cap Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.