The Vello White Balance Card Set for Digital Photography is an excellent tool for achieving perfect color balance in your photos. You can use it under any lighting condition, both pre- and post-production. This set includes an 18% grey card, a white card and a black card, as well as a detachable lanyard that will keep it handy at all times and an easy-to-follow user's guide to aid in proper usage
The cards within the small set measure 3.25 x 2" / 82.6 x 51mm.