Taken from Knitscene Magazine - '11 Winter: "Petite bobbles are achieved with a crochet hook in this cabled hat."
This pattern is in Knitscene Magazine - '11 Winter, page 62.
Size US 5-16" circs, US 6-16" circs, US 6 DPNs, US G crochet hook (or sizes needed to obtain gauge), and one cable needle are required but not included.