NATIONAL Brand Data Pad, 12 Columns & Plain, White Paper, 8.5 x 11", 50 Sheets (42383) Science and engineering notebook Spiral-bound with rigid white cover Lamy College ruled with margin on front and 10 x 10 quad ruled on back White paper with blue ruling Science and engineering notebook Spiral-bound with rigid white cover College ruled with margin on front and 10 x 10 quad ruled on back White paper with blue ruling. 60 sheets The data pad consists of 50 sheets. It is 3-hole punched with front side 12 columns and back plain.