10/box (case) TexWrite® 22 Cleanroom Notebook Blue, college-ruled, numbered pages 8½" x 11" (216mm x 279mm) Suitable for use in ISO Class 4 - 6 (formerly Class 10 - 1,000 cleanrooms). Cleanroom-packaged using Bag-Within-A-Bag® technology, permits alcohol wipedown of exterior bag before introduction of inner bag into cleanrooms, sterile suites and aseptic environments