Each of these 69 vintage subtraction flash cards measures 8.875" high by 2.875" wide with rounded bottom corners. The numbers are printed in black ink on manila paper. The subtraction problem appears on one side and the problem with its solution on the other. The cards are numbered in the top right hand corner accompanied by the word "Subtract." Manufacturer and exact age are unknown. Used but in very good condition with no significant damage or staining.