20/box (case) TexWrite® 22 Cleanroom Spiral White, college-ruled 3" x 5" (76mm x 127mm) 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.