Use whatever yarn you like. Drop the hook size down by 1.5-2mm in size for tighter stitches.

This pattern will use a hook 1.5mm-2mm smaller than the recommended hook size on the yarn you choose.

This pattern was made originally with a 3.5mm hook and DK scrap yarn from several Lion Brand Mandala Skeins. Using 6mm eyes

This is a Hub Cap or Wheelchair Spoke Cover that has a three part tutorial on my Youtube to assist you in making the end result. there are also videos to assist in making the outer ring and attaching mandala to your wheelchair.