Exo Black - is our thickest think from the 2 other, but easy to work with. Great for lining and solid black work. GO2 Black - is a classic black formulated to be an all-purpose black. With medium viscosity this ink is great for packing black with excellent saturation. Black Magic - is the thinnest and smoothest ink dispersion. It goes in easy and will do wonders for your shading. Brand: Xtreme Ink Color: Blacks Sizes: 1-oz, and 8-oz Sets MADE IN USA