Came from Australian Merino Micron 16.5um-22.5um, length 40-45mm very few skin ... without any chemicals, natural organic, eco-friendly3. Australian wool open tops are applicable to woolen yarns, semi-worsted yarns and ... rotor spinning.4. Fineness 16.5-22.5um, length 40-45mm5. No skin flakes, ... strength, whiteness, soft handfeel, high spinning rate Australian Wool Open Tops