This is the German Universal Outline Cap. It is highly sought after and rare. This cap works on more paint brands than any other cap. It works on Molotow, Montana, Rustoleum and More! The German Universal Outline cap makes nice clean lines. It's great for outlines and details. This cap is recommended. Since this cap is rare, you should stock up on it while it's still around. Please note this is a male cap and will only work on spray paint cans with a female valve system.