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Rule
189(1)
Construction.
The body of the discus shall be made of wood, or other
suitable material, with a metal rim, the edge of which shall
be circular. The cross section of the edge shall be rounded
in a true circle having a radius of approximately 6mm.
There
may be circular plates set flush into the centre of the
sides. Alternatively, the discus may be made without metal
plates, provided that the equivalent area is flat and the
measurements and total weight of the implement correspond
to the specifications.
Each
side of the discus shall be identical and shall be made
without indentations, projections or sharp edges. The sides
shall taper in a straight line from the beginning of the
curve of the rim to a circle of a radius of 25mm to 28.5mm
from the centre of the discus.
The
discus, including the surface of the rim shall have no roughness
and the finish shall be smooth and uniform throughout. The
IAAF has now specified that "smooth" is having
a surface roughness height not greater than 1.60 micro metres
( 63 micro inches)
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