This is heavy worsted weight.
I took needle range from the website, the label on the skein says 6-7, I suppose it’s American sizes, meaning 4-4.5mm.

Ethno yarn is made from wool by Bulgarian sheep bred in clean local area with minimum treatment during the production process. There is no air, water or soil contamination during this process , also it is made locally, so no transportation - related pollution has occured.

ETHNO is traditional carded wool that has been used for clothing, arts and crafts for centuries in Bulgaria.

Composition: 100% natural wool
Packing: ball, 170m / 0,100 kg 0.500 kg (5 x 0.100 kg)

For best results look for recommendations for knitting, ironing, drying and storage of knitting.