DGK Color Tools DGK-R27 XT Extra Thick 3 Card Set: DGK Color Tools Model DGK-R27 XT Extra Thick 3 Card set was developed for photographers who need a highly accurate, 100% coated 18% gray card that is extra thick with more solid and robust handling properties. Now 1.5 mm 1/16" thick. Guaranteed Accuracy from DGK - The White Balance Authority: The R-27 XT Extra Thick 3 Card Set is an accurate white balance card / 18% gray card for film and digital photo video. Spectrophotometer verified 18% reflectance. The R27 XT 8 x 10 x 1/16 inch size cards make it super easy to fill the viewfinder for white balance shots. Durable and Solid: The cards are solid and robust for easy reference on location or in the studio. The pocket size 4 x 5 card fits easily in your bag. What's in the package: Two 8 x 10 extra thick cards and one extra thick pocket-able 4x5 card. Includes easy instructions. Cards are not water resistant. Shipped in protective and reusable poly bag. Designed in Boston and made in USA: 100% Genuine DGK Color Tools products - shipped factory fresh.