A disc which has been modified after production such that its original flight characteristics have been altered is illegal, excepting wear from usage during play and the moderate sanding of discs to smooth molding imperfections or scrapes. Discs excessively sanded or painted with a material of detectable thickness are illegal.
A disc which is cracked or perforated is illegal.
A disc that is questioned by another player or an official is illegal unless it is subsequently approved by the Director.
A player who throws an illegal disc during play shall receive two penalty throws, without a warning. A player who repeatedly throws an illegal disc during the round may be subject to disqualification in accordance with Section 3.3 of the PDGA Competition Manual.
All discs used in play, except mini marker discs, must be uniquely marked. A player shall receive a warning for the first instance of throwing an unmarked disc. Each subsequent throw by the player with an unmarked disc shall incur one penalty throw.
