Written pattern includes information about gauge and size for both Hoooked Zpagetti and Novita Tuubi. You can, of course, use other t-shirt yarn/ribbon yarn as well.

I love to crochet rugs with this technique because I get to crochet back and forth into both loops and the other color is carried inside the stitch which makes a good and beautiful rug.

I recommend you to also take a look at the basic pattern for crocheting diamonds which you can also find as a separate Adobe Spark presentation.