I bought the 2mm markers when I think I would have much preferred the 1mm size instead. Didn't realize 2mm is basically your standard marker (think Sharpie), rather than a pen. However, I still like them and am impressed with the metallic sheen. The box advertises that they're made with eco-friendly and non-toxic water based ink. There isn't an unpleasant scent (no scent at all) to the markers, which is a plus. The markers don't bleed and write smoothly. Pretty good color selection in this pack of 10.