Outstanding performance and creative versatility these markers provide the ultimate solution to design flexibility and artistic liberty. Fast drying, alcohol based, non- toxic, refillable, double-ended, marker that comes in a vast variety of colors. They are constructed in a unique design for a more comfortable grip and so they will not roll away from you, fit into a special airbrush system, durable polyester nibs are easily interchangeable and available in 9 different weights and styles. Electronic production guarantees consistency of both color and output, precise colored capping system provides for instant color selection. COPIC markers are used by artists and designers worldwide. They are low-odor, blendable, and for use on paper, leather, wood, fabric, faux fur, plastics, and more. This set includes 12 markers (also found in 36 marker set SB36 and 72 marker set S72A only).