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
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Under IRB rule 2 the ball is to weigh -
410 - 460 grams
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a league ball has a preffered weight of 410g to 460 grams
a union ball 410 - 460 grams
so they are the same. Howver, both code use a ball much heavier for passing practice to improve that skill area