What weighs exactly 100g?

I need to calibrate my scales, and I do not have a calibration weight. I need to know what weighs exactly 100g.

And please do not say 40 pennies, or 20 nickels, or any coins in general, because the canadian weight for coins is not the same as the american.
I don’t have a weight, and the only way for me to get one is to order one.

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