The spherical pencils are around the 8mm chunky facet and have a soft quality that still would seem somewhat more difficult than Prismacolor Premiers. There have been no challenges even though sharpening or with Main breakage. These seemed best on white paper, the colors have been muted on black paper. https://best-colored-pencils-for59134.tribunablog.com/getting-my-what-are-the-best-colour-pencils-to-work-47776079