OVER THE RAINBOW has been handdyed onto a general purpose/sock yarn in 4ply.  Multiple colours merge into each other to produce newcomers throughout the hank, making it very pretty indeed.  
This yarn is soft with 75% merino pmus 25% nylon to give softness yet a durable wearing yarn, with great stitch definition.
Approx 100gms/400m.  Plenty for long adult socks.  
Recommended needles are 2.5mm to 3.25mm.
Gentle wash washable in cool water.  Dry your handmade item flat and in the sun to maintain shape and original colours.