Glass stopper, hollow and hexagonal Glass Stopper hexagonal hollow with flat bottom. 10/19, 12/21, 14/23, 19/26, 24/29, Glass stopper, hollow and hexagonalGlass Stopper hexagonal hollow with flat bottom. . 10/19, 12/21, 14/23, 19/26, 24/29, 29/32, 34/35 Glass Hexagon Stopper