The Mobius glass was named after the Mobius loop. in mathematics a Mobius loop is a surface with only one side. We felt this glass had a unique shape with its dangerous symmetrical curves & silver fumed base. Let the Mobius be the shining star of your collection! Craft Glasses For Craft Beer! #ThiccBois Specifications: - Volume: 16 - 19 Oz - Glass Blower: @RickBirdBarry - Fumed: Silver Note: All glasses are made to order, so please allow 3-5 days for production. These glasses are made individually by hand. Please hand-wash with extreme care. As with any piece of glassware, it is common for small air bubbles & other imperfections to appear. The imperfections will not affect the quality of the glass, but if this is an issue for you, please do not purchase our hand-blown beer glassware. All sales are final. Mobius Glass