How heavy is a rugby union ball?

15 ounce i read it on some website today . im sorry i dount no how much kilos that is

im gonna chek rite now i hope i helped you. and that was an old fashiond ball that i

said was 15 ounces so u mite wana chek it up. btw im 12

----

Under IRB rule 2 the ball is to weigh -

410 - 460 grams