Decocolor Acrylic markers have a 3-way chisel tip for thick and thin lines. They are great on stone, terra cotta, concrete, paper and wood. Water-based opaque pigmented acrylic ink is acid-free, non-toxic, and permanent when dry. * Keep tightly capped when not in use * Store markers horizontally * Shake well before each use * Easy clean up when wet * Clean nib when finished * Avoid storing in extreme temperatures. Store between 60° and 85° F.