Schachenmayr Boston Style knitting yarn is part of the My Mountain worldwide promotional campaign. Fiber Content: 42% Acrylic, 39% Polyester, 19% Wool. Weight & Yardage: Bulky yarn weight, 50 grams, 66 yards (60 meters). Gauge: 3 stitches = 1 inch using US 10.5-11 (7-8mm) knitting needles.