Blumberg's Basic Bill by Time Control System for Attorneys & Professionals, 100 2 or 3 Part Carbonless Paper Sets per Package (2-Part) 3 1/2 x 5 5/8, 2-hole carbonless, multi-part sets for 4x 6 files Last part is 35 lb. buff bond File chronologically, by matter, timekeeper, client or in a tickler Use as a data input form for attorney billing software This is a 2-part form; 3-part forms also available