3. Class-three wools: The fibers are from 4 to 18 inches long and are coarsened have few scales and less crimp than merino and class-two wool. Smoother and more lustrous. Good enough for clothing. Originated in U.K.

6. Needle breaking: 1. Incorrect size of needle for thread and fabric 2. Needle blunt 3. Pulling of material while stitching 4. Presser foot incorrectly set 5. Crossing a thick seam using a too small needle.