Section 2: Equipment
Ball (Rule 2.3): Korfball is played with a round, number 5 ball approved by the IKF. Its circumference must be 68.0–70.5 cm and its weight must fall between 445 g and 475 g inclusive. The ball must be inflated to the pressure printed on it such that, when dropped from a height of approximately 1.80 m (measured from the bottom of the ball), it rebounds to a height of between 1.10 m and 1.30 m, measured to the top of the ball. The ball must carry a printed pattern of at least two colours, symmetrical enough that the ball does not lose its visual roundness while spinning. Full specifications are set out in the separate IKF Ball Regulations.
Posts (Rule 2.1): Each zone has one post, fixed perpendicularly into the ground at a point midway between the sidelines, one-sixth of the length of the field of play from the endline. Posts must have an external diameter of 4.5–8.0 cm, be round (squared ends are permitted only to facilitate connection to the korf or a base), and, if made of synthetic material, must behave like metal tubing. Where a post cannot be fixed into the floor, a base-plate mount is permitted only if it is completely flat, has a maximum thickness of 1.0 cm, presents no tripping/injury hazard, has no cross-connections, and is stabilized against movement.
Korf / basket (Rule 2.2): An IKF-approved synthetic korf (the Dutch word for "basket") is fitted to each post. The korf must be cylindrical with no bottom, have its top edge exactly 3.50 m above the ground and parallel to it, be a strongly contrasting yellow colour, and face the centre of the field. Its official dimensions are 23.5–25.0 cm high, 39.0–41.0 cm inner diameter at the top edge, 40.0–42.0 cm inner diameter at the bottom, and a 2.0–3.0 cm top-edge rim width. The korf must be fixed so that it cannot move relative to the post, and the post must not protrude above the korf. Full specifications are set out in the separate IKF Korf Regulations.
Players' uniform and footwear (Rule 4.1): Players of each team must be dressed in a numbered, matching sports outfit sufficiently different in appearance from the opposing team's, and must wear appropriate sports footwear. The rules explicitly permit slight differences between men's and women's kit on the same team, provided the outfits look similar and share the same colours, in recognition of korfball's mixed-gender format.
Prohibited items (Rule 4.1): Players may not wear any object that could be considered dangerous unless it is taped or fixed so that it is no longer dangerous, and must keep fingernails closely cut and smooth. The rules cite rimless glasses, bracelets, necklaces, earrings, wristwatches, and rings as examples of dangerous objects. The referee duo is charged with checking players for such items before the match (Rule 4.6.h).