Istex

Weight: Worsted
Meterage: approx. 300 meters (328 yards)
Unit weight: 118 grams
Gauge: 19.0 sts = 10cm/4 inches
Needle size: 4.5mm (US 7)
Fibers: 100% Icelandic Wool

Weight: Worsted/Aran
Meterage: 100 meters (109 yards)
Unit weight: 50 grams (1.76 ounces)
Gauge: 18.0 sts = 4 inches
Needle size: 4 - 5mm (US 6 - 8 )
Fibers: 100% Wool - Icelandic

Weight: Sport
Meterage: 149 meters (163 yards)
Unit weight: 50 grams (1.76 ounces)
Gauge: 24.0 sts = 4 inches
Needle size: 2.5 - 3.5mm or US 1½ - 4
Fibers: 100% Wool - Merino