From the Knit Rowan website:
Big wool is a very popular yarn with designers and knitters alike. Made from soft 100% wool, Big Wool is easy to knit and produces designs with amazing cabling and stitch structure effects.
Details:
Fibre Content: Merino Wool: 100%
Season: Autumn Winter
Yarn Ball Weight: 100g
Yarn Meterage/Yardage: 80m/ 87 yards
Tension/Gauge Stitches: 7½-9
Tension/Gauge Rows: 10-12½
Recommended Knitting Needles:
Knitting Needle (UK): 000
Knitting Needle (US): 15-19
Knitting Needle, MM: 10 or 15