Heavy Duty 2-Pack (FNC-47) 80 Page Work Books Covers: Newark Paperboard Mills 60 pt. “Super Duty Chipboard,” with a heavy 2-color application of “DDC Orange” or “Blue-Sky Imagineering” and black inks. Innards: Finch Paper Opaque Smooth 70#T “Bright White,” with a fine, 1-color application of “The Whole Sky is a Cloud” soy-based Toyo ink. Covers printed on an Advance Process Supply Cameo 34" × 50" flat bed screen press. Innards printed on a 20" × 29" Heidelberg Speedmaster 74 with perfector. Bound with bombproof Renz “Double-O” Ring Wire, with appreciation to U.S. Patent #2142816, filed in 1935 by W. Walter Grumbacher. Corners precisely rounded to a 3/8" (9.5mm) radius. Ruled lines: 1/4" (6.4mm). Double Graph grid: 1/8" × 1/8" (3.2mm × 3.2mm). Work Book dimensions: 3-1/2" × 5-1/2" (89mm × 140mm) (excluding binding).