max 160 gram disc at japan open???

why is it that the japan open only allows players to use <160 gram discs?

[Brandon Swanson]

Ouch... I think a competitor threw a blade of grass on the scale under your disc. :-)

[David Jameson]

It was pretty ridiculous, but what can you do.

[El Kabong]

so sand some rim off and say you've been throwing on concrete...gotta be good for a - tenth or two!?

[Frank Callaway]

Isn't there a 150 class discs?

[Donny Olow]

http://www.herodiscusa.com/disc-golf-discs/150-class-discs