Abacus scorekeepers are the classic, low-tech, inexpensive way to track the score when you're enjoying a game of Table Shuffleboard with family and friends. Easily attaches to the top rail of your Shuffleboard table, and can also be mounted to the underside of the gutters. Our abacus scorekeepers are available in three styles, with red and blue plastic beads, black and tan plastic beads, or black and tan wood beads. durable way to mark your game. Each counts up to 21 points, and have alternating colors at the 5, 10, 15, and 20 markers for ease of viewing the score.