ONLY 150 OPEN CLASS P.D.G.A. APPROVED DISCS ARE PERMITTED DURING THE JAPAN OPEN DISC GOLF TOURNAMENT. In order to satisfy this requirement, there will be an official scale at the tournament to check your discs. Discs must be under  159.9 grams (lighter weight discs are of course acceptable) in order to be used at this year’s event. Players may be asked at any time during the tournament to weigh their discs. If there is any question about the legality of a disc, the tournament director will make a final decision. If a player is found to be in violation of this requirement they will be subject to penalties under PDGA Rules governing discs used in play (PDGA Rule 802.01D & E). In the past the Japan Open has always trusted players to conform to the 150 class requirement, but as the event grows the importance of this issue has become paramount. Since there will be a scale available at the tournament, this should not be an issue.