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This set consists of 2 necklaces - a 3D molded brass skull whose jaw opens and closes, and a 3D molded brass brain. The skull opens at the top and can be a locket or a receptacle for the brain pendant. It's held shut by a small magnet. The skull measures 1 5/8 x 1 3/8 x 1 1/8 inches. The brain measures 1 1/8 x 7/8 x 1/2 inches. The skull's chain is 35 inches; the brain's chain is 28 inches.