Dynasphere Challenger Ball Set

And the Vanadium set goes a step further by matching every single ball in the set down to exacting tolerances (e.g., matching weights within ±1.0g), unlike the Challenger set.
What do you mean by, "unlike the Challenger set"?
The tolerance is the same for both sets. Also, the Challenger set is the first set to be produced on a fully automated production line. It would be hard to beat the consistency of a fully-automated line.

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