Specifically designed with flipcharts in mind. Unique slim barrel created for marking vertical surfaces. Even-Flow technology delivers consistent bold marks no matter what writing angle you're using. Water-based, low-odor ink won�t bleed through paper. Versatile 1/4" durable chisel tip marks in a variety of line widths. Visible ink supply window. Marker Type: Flipchart; Assortment: Black; Blue; Green; Red; Color(s): Assorted; Tip Type: Chisel.