Ecru knitting cotton size 10/3 100% cotton. Ball of about 133 metres.
This thread is the thickest in this range: the number 3 signifies that is twisted with three strands. This thread is singed and mercerized, meaning it passes through a flame to remove all fluff and make it smooth, before undergoing a treatment to make it shiny and easy to use.
This yarn is presented in a 40 gramme ball. XF Au Franc Or is a very old cotton thread brand which now belongs to Ets Toulemonde, also owners of the Fil Au Chinois brand.