Pilot Frixion Erasable Markers (Point Size: 2.5mm) - Great for Quilting/Sewing/Crafting/Scrapbooking. For Quilting/Sewing on thick fabric, e.g. flannel fabric, fleece, etc: Very smooth felt-tip markers with erasable ink. Great for pattern transfer/design pattern Ink will disappear once heat/friction is applied!!! No residue. No smudging or fading. For Crafting/Scrapbooking Project/Design Works: Write, Erase, Rewrite! - Erase and rewrite repeatedly without damaging documents. No wear or tear! - Thermo-sensitive Gel Ink Formula disappears with erasing friction. Smoothwriting Gel Ink