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Mennon Multi-Function Waterproof Gray Cards 4 in 1 Set Distinguished from the traditional mennon paper Gray Cards, mennon multi-function Gray Cards are made from organic materials. These cards are compact, portable, waterproof, scratch resistant and mainly meant for heavy duty outdoor use. With a gray card or white card you get the color balance by measuring the color temperature of the light transmiting in the photo scene; and when you shoot in a high contrast scene, a black card helps you to reduce the exposure value of the lightest parts of the highlight to get the high-contrast scene balanced in a way of covering. Items Included: 1- Gray Card 1- White Card 1- Black Card 1- Semi-transparent Card. The size of the cards is about 4x6 inches.