Quilling square vortex coils is a bit more challenging than quilling the basic vortex coils. You can use any type of quilling paper and which size you like. I like using shredded papers that is 3mm x 297mm. I also tried using quilling strips that I cut mysefl.
Step 1: Step by Step Video Tutorial on How to Make the Quilling Square Vortex Coils
Here's a step by step video tutorial on how to make those quilling square vortex coils. Hope you will have fun making them! :)