Online Store › 081525-Y-K White Birch Fiber Arts, 80/20 Merino/Nylon, Black & White, 120 g Image 1 of 1 081525-Y-K White Birch Fiber Arts, 80/20 Merino/Nylon, Black & White, 120 g $10.00 White Birch Fiber Arts. 80% Merino / 20% Nylon. Black & White. 120 g skein (480 yards). Add To Cart Added! White Birch Fiber Arts. 80% Merino / 20% Nylon. Black & White. 120 g skein (480 yards).