In case you're interested...
I used approx. 164yd/150m of Needful Yarns Filtes King Super; a good substitute would be a smooth yarn with a ball band gauge of 12 sts=4"/10cm. Really, you could use any yarn at any gauge. Something smooth with good stitch definition is best. You'll need a 24"/60cm circular needle of the right size for your yarn; I used a US #11/8mm needle. The gauge for the piece I made is about 12 sts=4"/10cm.
Cast on a multiple of 8 sts (I used 88 sts). Place marker, and join to
work in the round. Work Rounds 1-16 of chart until piece is about
2"/5cm less than desired length. Work Rounds 17-24 of chart, then
continue in 1x1 Rib as set by Round 24 for at least 1"/2.5cm.
Bind off; I used a tubular bind off.