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Acrylic Photo Blocks: Photo Gallery Portrait Acrylic Block, 5 X 7 Inches, Multicolor, Black/White We Offer 12 Acrylic Block Sizes To Help You Select The Best Format For Your Treasured Photo – Whether It’S Vertical, Horizontal, Or Square. Our Acrylic Block Photo Printing Gives You High Resolution For Sharp Images In Sizes That Range From 4 X 4 Inches Up To 8 X 12.