Edit 1 - meterage
I have made an estimate of the meterage of each ball.

1g = 10m. To calibrate, each ball weights approx 12g on my home scales, hence the measure of 120m per ball.

Edit 2 - gauge
On 3.25mm needles

26st = 10cm
40 rows = 10cm

I’ve added these notes to help any other users, but they are estimates so please do take your own measurements. andrea-j