Anchor Artiste Mercer Crochet Cotton Thread 40 - Finest quality Egyptian cotton thread, double twisted and double mercerised for extra strength and durability. 100% mercerised crochet cotton thread. This yarn has replaced Coats Mercer Crochet Cotton. The 50g balls are available in 7 shades in white, creams, beiges and taupes. 50g ball approx 550m. The 20g balls are availble in colours but only a few. 20g ball approx 220m.