Harrows Official Competition Bristle dartboard The Official Competition Bristle dartboard from Harrows is a high-quality dart board that is suitable for official dart competitions. The board has the official dimensions. The bullseye of this Harrows dart board is free of staples. This means that the border of the absolute center of the board is not fixed with annoying staples. This reduces the risk of rebounding arrows, the so-called 'bounce-outs'. The different beds of the dart board (the scoring surfaces) are separated by round wire. The Harrows Official Competition Bristle dartboard is made of sisal. Sisal is a fiber that is extracted from the agave and other plants from warm regions.