Stillman & Birn Epsilon Softcover Sketchbook, Heavyweight 100lb, White, 48 Sheets, 3.5x5.5 Contains 48 sheets of heavy-weight 100lb archival paper The paper is white and has a smooth surface Ideal for pen work but suitable for use with all dry media and light washes ph neutral as well as lignin and chlorine free Flexible yet rugged soft-bound cover with sewn bindings