Fotasy GCSET 2-In-1 Microfiber Cleaning Cloth with 18% Gray Card for DSLR Camera and Lens (Black) This large Cleaning Cloth helps to clean your camera lens, or anything needs gentle case during wiping or cleaning. It is in 18% Gray Color, assist user to set correct exposure and white balance. Size: 300mm x 300mm (11.8'' x 11.8")'