Tervis Tumbler Company is an American manufacturer of double-walled, insulated tumblers. Fostoria's Novelty Glass Company produced "fine lead blown tumblers" and stemware. Tumblers are flat-bottomed drinking glasses. The event witnessed the usage of reusable tableware and stainless steel tumblers. Equiano sold fruits, glass tumblers and other items between Georgia and the Caribbean islands. Modular locking mechanism cylinders frequently employ pin, wafer, and disc tumblers. Rotary tumbling is more common, simpler, quieter and less expensive than vibratory tumblers. Integrated locking mechanisms directly engage the padlock's shackle with the tumblers. U-locks with tubular pin tumblers should be avoided, though most manufacturers no longer offer them. Small tumblers (one pound capacity) are available and inexpensive for home/hobbyist use. A more secure type of mechanism has two separate tumblers, each opened by one key. In "The Dark Knight Rises" (2012), several Tumblers are seen. It was initially used to train tumblers but soon became popular in its own right.