With its unique 3-in-1 design, Spectrum Noir's TriBlend Markers are a true break-through innovation for coloring. Inside each marker, there are three separate ink chambers, each feeding through to a fine-bullet nib, so you can experience three colors inside a single alcohol marker for the first time. When used together, these colors will combine to give you a seamless, controlled blend each and every time. With no guess-work or waiting for the correct shade to appear. Now anyone can color and blend like an expert! This package contains twenty four non-toxic alcohol based markers, 72 colours.