This is an add on service to have your yarns wound into balls or cakes for ease of use. My yarns arrive to you as skeins/hanks by default. If you don't have a yarn winder and would lke to have your yarn made into a center pull, then this is the service for you. Art yarns and super bulky yarns may be hand balled instead of made into a cake. You will add a quantity for each skein that you'd like to have wound. If you purchase multiple skeins but only want a particular one wound, please indicate which you are adding the service for.