These hard cover sketch books feature high performance paper that is milled from pulp with an alpha cellulose content that exceeds 87 the heavy weight 100 lb paper has a toothy ivory vellum surface with superb erasure characteristics and is suitable for all dry media it will accept light washes as well the covers are made with extra heavy weight binders board that is super tough and resistant to warpage this hard bound book contains 62 sheets and was bound in the usa