Gel Roller for Fabric, Bold 1.0 mm Tip, Permanent, Blue Ink, 1 Pack (BN15BPC)
Sakura 44181 Identi-Pen Blister Card Permanent Marker, Black Zentangle recommends this Sakura dual tip permanent marker for tangling on fabric. It leaves a permanent mark on most non-porous surfaces.
Gel Roller for Fabric, Bold 1.0 mm Tip, Permanent, Black Ink, 1 Pack (BN15BPA)
Tsukineko Dual-Ended Fabrico Marker Color-Fast, Cool Gray Fabrico's gray markers are good for drawing your string and shading your tangles on fabric
Gel Roller for Fabric, Bold 1.0 mm Tip, Permanent, Red Ink, 1 Pack (BN15BPB)
Sharpie 1779005 Stained Fabric Markers, Brush Tip, Assorted Colors, 8-Count Tee Juice Markers come in various widths so be sure to look for the tip you need.