The MTN Hardcore Caps gives about 5 - 12 cm wide lines

The same coating that defines the rest of the line keeps alcohol marker ink from pooling or bleeding past its edges

This pack includes twelve different neutral grey markers and you can add to them by buying different colours separately here: Stylefile Marker Classic

color matching across a large project doesn't depend on guessing whether a close-enough substitute will read right next to the original reference

or distorting

flux empty marker fx pump 150e Molotow ONE4ALL markers and refills The MTN Hardcore Caps givesA handy pump valve marker with a easy refill in the bottom and a 15mm broad tip.