Many have asked about the difference with family set and challenge set.

After many steps of culling. We identify those with potential, we'll group it in challenge set. for family set it is those potential not yet surface, but there're chances potential will come in the later stage and some may not, (for my case, i've experience it when it is 7-8 months old... with the sudden change with its' overall balance and it becomes one of the best in my collection, before that, it is just an ugly duckling...)

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Japanese Ranchu is another ball game