There are very few natural displays of color that are as beautiful as the Aurora Borealis. That ethereal show of color produced by the Northern Lights inspired the design of our 'Aurora' collection, Cantel Blown Glass Artisans explain. They craft the tumblers by hand, using traditional blown glass techniques featuring swirling lines of color like orange, yellow, green and red underscored by aqua 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.