3.5-oz (100-gram) balls of Opal Uni-Color sock yarn. Each ball contains approximately 465 yards. One ball is enough to make one average pair of socks.
Machine wash and dry.
75% Superwash Wool, 25% Nylon. 4-ply fingering weight. 28-32 stitches = 4 inches on U.S. size 1-2 knitting needles.
Note that the stock of some colors is limited.