Sanford Ink Corporation Marker Refill, Permanent, Fine Point, BlackRefill is designed for use with the Sanford Sharpie Stainless Steel Marker, Simply unscrew the ink cartridge to replace with Sharpie ink refill cartridge, Fine point tip size is designed for marking and writing, Refill contains a quick-drying, certified AP nontoxic formula and marks on most surfaces, Fade-resistant and water-resistant ink encourages multiple project uses, SKU: DLRDY086831