From the WATG website

YARN FACTS

YARN WEIGHT
25g = 100m / 109 yds, 4-ply / fingering yarn

COMPOSITION
80% Viscose, 20% Metallized Polyester

TENSION SWATCH
28 sts / 37 rows in stocking stitch on 3.5mm (US4) needles

SUGGESTED CROCHET HOOK SIZE
3mm - 5mm US 2.5 - US 8

SUGGESTED KNITTING NEEDLE SIZE
3mm - 5mm US 2.5 - US 8

HOW TO WASH
Hand Wash at 30 °C