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See page 8 for more details.
Four cards printed on both sides in the
following contrast levels: black, 25%, 10%,
5%, 2.5%, and 1.25%. Cards are 9″ x 9″ (23
cm x 23 cm). Includes instructions.
Double Sided (four cards, shown) . . .253500
Single Sided (seven cards) . . . . . . . .253510