OTR.984 is a super permanent alcohol-based high-quality ink. For indoor & outdoor use. Works on paper, metal, plastic, glass, and stone. Can be used on canvas, walls, mixed media, and many other surfaces. Best on smooth and dust-free surfaces! Use the OTR.984 with alcohol-based ink markers, pump action valve markers, brushes, air brushes, or any mob & squeeze marker etc. 210ml.