POSCA paint markers are water-based drawing tools for use on all surfaces. Very rich in pigments, the ink formulation delivers bright, matte, opaque colors that withstand the passage of time. The odorless marker colors are layerable once dry, and mixable while wet. POSCA does not bleed thru papers. It is permanent on porous surfaces such as wood, cardboard, stone, certain plastics and rough metals. On fabrics, iron from the the inside out to set. On non-porous services such as glass, ceramics, PVC and smooth metal, it can be erased very easily. ACMI certified and made in Japan. The medium tip 5M marker is a versatile size measuring 1.8 - 2.5mm.