Cantel Blown Glass Artisans create the vibrant design of these unique tumblers. The Guatemalan artisans are experts in the legendary art of blown glass techniques, crafting each glass entirely by hand with capricious strokes of cobalt blue. Because each piece is handmade, shape and size can vary slightly and tiny bubbles may appear within the glass. This exemplifies the hand-blown technique, making every piece a unique example of blown glass craftsmanship.