Bulk Pack Pioneer RST-6 4x6 Photo Album Refill for STC-46, STC-504 - 160 Pages (80 Sheets) Optically clear side-loading pockets white paper inserts 3 holes spaced 4-1/4" apart, Page dimensions: 13" x 6-3/4" Acid free, archival, photo safe 160 Pages (80 Sheets), Bulk Packaging