The round pencils are around the 8mm chunky side and possess a soft quality that also would seem a little bit more challenging than Prismacolor Premiers. There were no concerns whilst sharpening or with core breakage. These appeared best on white paper, the colors were being muted on black paper. https://thebestcolorpencilbrand58913.arwebo.com/56084481/the-best-side-of-best-colored-pencils-for-artists