Water Worlds from Opal is inspired by the colours of the underwater marine sea life. Opal yarn is not just for socks, great for accessories and knits or crochets to most 4ply patterns. Each 100grm ball is 425mtrs in length. The recommended needle/hook size 2.5mm..to..3mm. The composition of this yarn is 75% Superwash Virgin Wool, 25% Polyamide. Machine washable up to 40c….