Please make sure to get the revised edition of this pattern!

Shawl uses 1 Rainbow Roll in each of two colours. Yarn is held double throughout - remove the cardboard centre from the rolls and you can work from the inside and outside of the roll at once.

From the Pattern:
“Helpful tips when using Rainbow Roll:
Special care must be taken when knitting with this pencil roving. It is not spun and is delicate and can break quite easily. This is not a problem however as you can simply overlap the two broken ends and knit them together for 3-4 stitches. There needs to be a clear path with no obstacles (ie: chair legs, dogs, cats, etc.) between the roll and your
knitting needles. We’ve found the best way to feed your yarn is to carefully unravel several yards at a time between knitting every few rows. This avoids the usual habit to simply tug at the skein to feed more yarn. When using the roving doubled, it is quite strong and a bit easier to knit.”