The segments spread out from this ring broken only by the 'treble' ring about half way to the edge and 'double' ring which marks the rim of the circle. At the centre is a small black circle called the 'bullseye' and, surrounding that, a thin red ring called the 25 ring. It consists of a circle of 20 segments numbered from 1 to 20 in a seemingly random fashion. The pattern on the board is delineated by wire and hue.
A good board should be made from vegetable fibre and is called a 'bristle board'. By far the most commonly used design of darts board today is the 'clock' or 'trebles' board and that is the only board that will be considered in these instructions.
