Prismacolor Premier Double Ended Art Markers are designed for every level of expertise. Advanced ink formulation provides rich color saturation with smooth, silky ink flow and coverage. Alcohol-based, dye-based ink delivers an impressive color laydown. Create different line widths using the double-ended design. Single ink reservoir is designed for a perfect color match end to end. Ideal for both technical and artistic applications, these markers are certified AP nontoxic.