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Fantastic video by Vertiasium on this: https://www.youtube.com/watch?v=ZMByI4s-D-Y

(side note: that video is about a sphere, but the current standard kilogram and its copies are actually shaped like little bells)

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To clarify: that sphere is not a 'standard' in a sense that it is going to definite a kilogram. It is a tool which is going to be used to measure the correct numbers to define the kilogram in terms of universal constants. In this sense it is very different from the 'bells' you refer to, and I think the way you stated the link was misleading.

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