Filled with the highly opaque

and bold outlines

fast-drying ink and trace lines that are 1 mm in width

The markers come in different sizes and this one has a 15 mm fibre tip

viking spectra bonefolder 16 cm Chrome Season Filled with the highly opaqueThe Spectra bonefolder is made from solid natural cattle bone rather than plastic, which matters for what this tool is actually used for: plastic folders can flex under pressure, melt slightly from friction heat, or leave a shiny burnished streak behind on delicate paper bone stays rigid and smooth without any of that, since it's chemically inert and doesn't react with the paper surface the way plastic can. The two ends serve different jobs: a sharp,