Necklace made with a piece of circuit board, it is approximately 3/8" x 2" (10 x 50 mm). The board piece is bare with no surface coating, so you can see and touch all the details on the board. The ball chain is black toned and 70cm (28") in length. It can easily be shortened with regular scissors. Color options for board piece: - blue - dark blue - red - green - black (dark brown) - purple - yellow (olive green) - orange The colors may vary slightly due to characteristics of the particular board.