Sizes:
One-size, but you can easy make it smaller or bigger either by working with fewer or more stitches, or by changing the yarn and/or the needle size.

Needles:
Circular needles: 4,5 mm

Gauge:
In garter stitches with 4,5 mm needles:
5 x 5 cm = 8 stitches x 17 rows

Yarn:
30 skeins DROPS Merino Extra Fine, 15 in each colour