The red Needle Cap, for details, effects and experimantation, offers a thin, hard line. It's a completely different diffuser which is designed to propel paint further than the rest. It has a small spray opening which makes it a little tricky to control, but it leaves the door open to experimentation, giving a uniquely dirty and undefined touch. Stroke width: ca. 1,5 - 3 cm.
Works on all cans. Here the Pack of 100 Caps.