This is truly a 3D pattern. It looks like there is a cable that lays on top of another. This is a very easy arm warmer even if you haven't made a cable pattern before. You're only using the cable needle twice out of 12 rows. It's a basic 6 stitch crossover, left and right. Stockinette Stitch borders the cable pattern.
4 stitches per inch , 4.88 rows per inch
70 yards of Worsted weight