JJC GC-3 Set of 3 Digital Grey white balance card , waterproof , portable With strap and detachable lanyard JJC GC-3 Set of 3 Digital Grey white balance card waterproof portable With detachable lanyard The JJC GC-3 White balance card set for digital photography is an excellent tool for achieving prefect color balance in your photos. You can use it under any lighting condition, both pre-production and post  production. This set includes an 18% grey card, a white card and a black card, as well as a detachable lanyard that with keep it Handy at all the times and an easy to follow users guide to aid in proper usage. Measure 5.12 x 3.93  / 130x100mm. For protect color balance Use with any digital camera.