Next Generation Spectrum Noir pens are alcohol ink based markers which have been designed specifically for crafters, but these affordable markers are also great for beginners, students and hobby artists alike. Each pen is double-ended, with a broad chisel nib for large area fills and a fine bullet tip for detailed work. This great value twenty-four pen box DARKS Set contains a spectrum of colors in DARK shades, ensuring that you always have colors which work together. Spectrum The colors blend seamlessly, and can be mixed or layered over each other. For stunning results use with Ultra Smooth Premium White Card Stock (sold separately), which is perfect for use with alcohol based pens.These fast drying, alcohol based markers are acid-free and non-toxic, and the colored ends of the pen allow for easy color identification. The image color has been reproduced as accurately as possible. The next generation Spectrum Noir markers feature a hexagonal barrel shape to be more ergonomic, rubberized grips for comfort and double-walled caps for extended time between refills. The bullet tip nib is finer, for additional detailing and the chisel nib can be replaced with a brush nib (available for purchase separately).