Nakpunar Brand Spherical Round Bottle Stopper with leak proof rings for soda, liquors, wine, champagne, beverages to preserve them and keep them fresh. 18 mm wide. Works with 17-18 mm opening jars and bottles. Works with most of wine bottles, Nakpunar brand corked bottles (except cut crystal shape spherical bottle) Made with high quality acrylic this economic, reusable, airtight glass bottle stoppers are a must in your kitchen, DIY wedding favors, your bar and liquors te keep them fresh and preserved. The rings will create air and leak proof barrier and will keep your liquors, fruit juices, perfumes safe.