This yarn is sold in single plys and you can order how many plys you want to have, so weight & yardage will vary, but you pay by 50g units

About the yardage:
Here are some infos from the homepage of the manufacturer on the yardage according to the number of strands you want to have
fädig means plies
100% Merinowolle extrafein
Lauflängen:
1-fädig 50 gr. 750 mtr.
2-fädig 50 gr. 375 mtr.
3-fädig 50 gr. 250 mtr.
4-fädig 50 gr. 187 mtr.
5-fädig 50 gr. 150 mtr.
6-fädig 50 gr. 125 mtr.
7-fädig 50 gr. 107 mtr.
8-fädig 50 gr. 94 mtr.