Weir Crafts Merino Wool Roving for Felting - 1 Ounce OAK Merino wool roving - one ounce OAK 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.