Gauge doesn’t matter for this pattern. You want a reasonably thick yarn, anything sports weight or thicker will do. You need about an ounce of yarn and a crochet hook in a size appropriate for your yarn. Try for a fairly dense fabric.
Ch 3. Join in first chain with a slip stitch to form a loop.
Repeat rnds 3 and 4 until piece measures about 4 inches in diameter.
Repeat rnd 3 until piece curls over itself sufficiently. You can put it down to check it every few rows.
End off. Weave in ends.