Material and tools:
50g, 76yd (70m) Color A yarn,
100g, 153yd (140m) Color B yarn,
Crochet hooks: G (4mm) and H (5mm) or size that gives correct gauge.

You can use any Bulky weight yarn approx. 140m/100g.
You can use multiple strands of the yarns to make up a single strand of Bulky weight.

Stitches and Abbreviations: (US terminology)
Chain – ch
Round(s) - Rnd(s)
Single crochet – sc
Back post single crochet - bpsc
Slip stitch – sl st
Stitch(es) - st(s)