3 in 1 Digital 18% Gray/White/Black Card Set Exposure Balance with red Strap
Features:
100% Brand New & High Quality 
Ideal for helping achieve white balance and color correction
An excellent picture is produced with the precise exposure. If the light in scene is excessively bright or dark, exposure deviation might be produced.
Allowing the camera to compensate for the illuminant color in a scene
In other words the Digital Color Card is an excellent addition to any studio because it allows you to create sharp images that really reflect the color of the scene
Designed to work with a Digital SLR camera 
Can be used it pre or post production 
Includes a holding strap with detachable clip 
Specifications:
Material: plastic
Size: 85 * 55 mm/3.3 * 2.1"
Strap length: 820 mm/32.3"
color: gray, white and black
Package Included:
1 x Gray Card
1 x White Card
1 x Black Card
1 x Attachment Strap