Wine preserve: the inner diameter is 3 cm (standard size). Groove design inside wall keeps your wine tight and tight. the oxidation process, extend and preserve the aroma of the wine and keep the wine with a natural smell. DIY design: wine silicone caps stopper is plain and with these markers you can your wine bottle. So you never have to worry about finding the wrong bottle. You can create your own favourite DIY design or mark the bottle cap. Easy to clean: our sustainable silicone bottle lid set is dishwasher safe and can be washed upside down in the machine. Or with detergent and hot water 16 x bottle caps made silicone. Washable and perfect for many bottle types, whether wine, oil or juice Versatile: the bottle lids are flexible and therefore fit a variety of glass bottles: whether as a wine bottle lid, beer closure, as a champagne stopper and much more.