3.5-oz (100-gram) balls of Opal Neon 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.