Inger Johanna: Knitted cushion cover. Polarized dark gray in knit stitch. I put up 25 stitches, using needles 15. Have an inner pillow is 40x40 cm. Knitted pretty loose so I could stretch a little bit, wanted it to look. Hard to say with the number of balls, I had some at home that was not that ball anymore :) but I would think that 4 ball is about right. luck!