Merino Wool Roving for Felting - GRAY (1 ounce) Merino wool roving - 1 oz: GRAY Fine and silky quality wool for nuno and needle felting. Very fine, 21 micron fiber. One ounce is approximately a 1 - 1.25 yard length. 51 COLORS AVAILABLE - click "Weir Crafts" at top of listing, then "wool roving" section, to see all colors. SAVE: buy 2 or 4 ounces for lowest price!