Terra Stack + Stubb Tumblers, Set of 4These Terra Glassworks handblown rocks glasses are the signature pieces from his collection! They are stackable, durable, beautiful. Each set consists of four glasses of two different glass shapes to make the stacking possible. The "Stubbs" tumblers are straight walled, and are the bottom portion of the stack. While the "Stacks" tumblers are shaped with thick stems to stack inside the Stubb glass (A Stacks tumbler can also stack into another Stacks