Montana ACRYLIC Marker Set EXTRA FINE 6pcs. Set 0.7mm. The Montana ACRYLIC Marker EXTRA FINE Set contains six ACRYLIC EXTRA FINE Markers 0.7mm in basic colors. The Markers are packed in a reclosable transparent plastic box for a fast overview and comfortable handling. Single Markers contain water-based ACRYLIC paint, refillable, replacable tips.