Dart boards are usually made of sisal fibres or boar bristles and are marked 1−20 in a clockwise pattern. A regulation board is 451mm in diameter and is divided into 22 sections. Each section is lined with thin metal wire. The numbers indicating the various scoring sections of the board are normally made of wire. The inner ring is called the ‘bull’.
The overall dimensions are as follows:
- double and treble ring inside measurement ─ 8mm
- bull inside diameter ─ 12.7mm
- outer bull inside diameter ─ 31mm
- centre bull to inside edge of treble wire ─ 105mm
- centre bull to outside edge double wire ─ 168mm
The dart board is fixed on a wall or mobile stand, allowing for a minimum of 3m between boards measured bull to bull. The dart board is hung so that the perpendicular height from the centre of the bull to the floor is 1.73m, eye-level for a six foot man. The dartboard is fixed such that the ‘20’ segment is coloured black and at the top of the dartboard.
ochre is the line behind which the
throwing player stands. It is 25mm
high and 915mm long and placed in a
position where the minimum throwing
distance measured from the rear of
the raised ochre is 2.37m along the
floor to a plumb line at the face of
the dartboard. The diagonal distance
from the bull centre to the rear of
the raised ochre at floor level is
The encroachment line is a tape line located 1.5m behind the ochre. This is where a player must stand as his/her opponent is playing a shot.