This mop is filled with permanent black KRINK-ink

The Sharpie Fine Point is a nontoxic permanent marker used for autographs

Size: 20 x 50 cm

there's also a 3-pack

984 Flowpen Ink marks on almost everything

molotow tagger speedflow chisel marker 2 6 mm DEFS This mop is filled withThe Molotow Tagger Speedflow Chisel Marker 26 mm is a waterproof permanent marker designed for fast, juicy paint application on almost all smooth and rough surfaces. Filled with alcohol based Speedflow ink, it delivers opaque, glossy and fast drying results for tags, sketches and permanent markings. The 26 mm chisel tip allows both broad strokes and sharp edges, making it ideal for calligraphy style tags and highly effective for tagging on stickers.