The Propus Window is a twin-type marker great for highlighting, underlining, and fine writing. One side has a windowed chisel tip, which allows you to see the characters you are highlighting clearly. The other side has a .4mm fine plastic tip perfect for writing and underlining. There are 15 fantastic colors in this series. 5 clear and well-defined colors, 5 earthy and calm colors, and 5 soft and gentle colors.

• Twin-type: chisel with window on one side, .4mm fine tip on the other
• Light (soft and gentle) colors: Light Pink, Light Yellow, Light Green, Light Blue, and Light Violet
• Smoke (gentle and calm) colors: Smoke Red, Smoke Orange, Smoke Green, Smoke Blue, and Smoke Gray
• Standard (clear and well-defined) colors: Pink, Red, Green, Blue, and Black
• 5 Color Sets also available