Pilot frixion pens have been my go to fabric marker for a few years now. They have a 0.7mm rollerball nib and the blue ink is erasable - either by
8 X Pilot Frixion Pen Erasable 0.7mm Rollerball Write Heat Erase Colour Pen Friction
Pilot Frixion Clicker 0.5mm Violet - So Typical Me (IE)
Pilot FriXion Ball Erasable Gel Ink Pen 2pk
Pilot 31568 FriXion Ball Erasable Gel Pens, Fine Point, Assorted Color – Value Products Global
Pilot Frixion Heat Erasable Pen– Mindful Mantra Embroidery
PILOT CLICKER BLUE, (PACK OF 6)
Pilot FriXion Clicker Retractable Erasable Gel Pens, Fine Point, Blue Ink (6)
Blue Frixion Ball Erasable Gel Pen, Pilot #FX7-BLU
Pilot Waai FriXion Erasable Highlighter - Trendy New Colors – CHL-STORE
Pilot FriXion Ball Clicker US Gel Pen - 0.7 mm - Navy
Make corrections while you write with this 6-pack of Pilot FriXion Point extra-fine-point assorted erasable gel pens., Add bright colors to notes with
Pilot FriXion Point Erasable Gel Pens Extra Fine Point Assorted Ink 324192
Pilot FriXion Ball Knock Erasable Gel Pen 0.5mm 10 Colors — A Lot Mall
Pilot FriXion Ball Slim Gel Pen - 0.38 mm - 20 Color Bundle