Stillman & Birn Gamma Wirebound Sketchbook, Heavyweight 100lb, Ivory White, 50 Sheets, 9x12 Contain 50 sheets of heavy-weight 100lb archival paper The paper is ivory white in shade and has a vellum surface Toothy vellum surface with superb erasure for dry media ph neutral as well as lignin and chlorine free covers made of extra heavy weight binders board