Colorona Premium Double Ended Alcohol Based Colorless Art Marker, Superior Ink Graphic Dual Twin Tip Blend Able Permanent Sketch Pen, Fine and Brush Point Blend colors for stunning effects such as 3d, smooth transitions, highlighting shading and blending Perfect for any use, manga, cartoon illustration, sketching, fashion design & adult coloring books Suits every one - artists, illustrators, architects, kids, teens, adults, beginners and students Smart design provides a variety of line widths by increasing/reducing pressure and twisting the nib Next generation blender pen with unique ergonomic design for limitless creativity