Noro Silk Garden Sock weight yarn.
25% silk, 10% mohair, 40% lambswool, 25% nylon for strength.
3.6 - 4.2 mm needles (stated on the band, others recommend 2.25-3.25mm needles)
Note: From time to time I go through and check what is still available from the distributor. Colours that I cannot get any more of are marked with a *. Although, of course, this will change if they sell out from the distributor, so it's wise not to assume that unmarked ones will still be available!