silicone stopper soft,durable and safe size:dia 4.7cm, top dia 5.6cm good quality with SGS testing certificate for oak wine barrel We are aprofessional manufacturer of oak barrel for winery of overseas and native markets.Our oak material is from France and America.Our products cover oak barrel,cork,oak hub and oak funiture. We guarantee good quality and price for our honorable buyers. Welcome to our company and factory