The round pencils are over the 8mm chunky facet and also have a soft quality that still seems a tiny bit tougher than Prismacolor Premiers. There were no difficulties when sharpening or with core breakage. These seemed best on white paper, the colors ended up muted on black paper. Arteza https://messiahocozm.mybloglicious.com/53769720/everything-about-best-colored-pencils-for-adults