Not Sure On Wool Weight

I have been given 4 50g balls of “Patons” “Cotton Garland”, it states on the ball band that it knits as cotton, but there is no mention of needle size. Don’t think the wall is made anymore so any ideas would be gratefully received!

It’s a DK weight and the needle used for 20sts/4" are a size 6/4mm Since this is a boucle yarn, you might need a larger size to make something with as they tend to need a looser gauge than smooth yarns. You have almost 400 yds, btw…