Any worsted weight yarn, about 50g.
J (6mm) hook
Ch 144. (for the thinner one I did 134)
Skip the first 3 st, dc in next st. *ch1, skip one st, dc* to end of row. Turn.
Ch 3, dc in next ch1 space, *ch1, dc in next ch1 space* to end. Turn.
ch 1, dc between dc and ch3. Repeat this until desired width.
The thin one had 4 rows. The purple and sky blue ones had 7.