1G Balls clarification

[sk1nnym0nkey]

Can someone tell me if the 1gram tolerance in these sets are from the lowest weight to the highest (e.g. 141g-142g)

Or

Is it 1gram either side of say 142g (e.g. 141g-143g)

Hope that makes sense

Thanks

[Nifty50]

Lightest to heaviest 141-142