Any wool can be used as core wool. You can even use polyester batting if you like. The idea is that the wool will make the base of your creation and will not be seen.
You don't have to use core wool at all, especially for smaller items. You can use any carded wool as core and as finishing wool. For instance this type of wool link would work very well.
This listing is for chunky carded wool in rope form, carded sliver.
This wool vary from batch to batch
Pick from cream or brown
100g /3.5 ounces