Hand bound kettle stitch text blocks for bookbinding. Each block is bound with hand waxed thread, pressed, sealed with pva glue, and then reinforced with a band of heavy duty, flexible tape along the spine. Each text block contains 60 pages (120 front and back). The beige paper is 65lb cardstock. The white paper is 40lb Heavyweight project paper. Tea stained paper is made with the 40lb heavyweight paper. As for secondary colors, they indicate the end sheets which will ultimately hold your finished book to its cover (assuming that you use this text block for your bookbinding project).