Kaavie 2 in 1 Large Size White Balance Gray Cards (2 pcs) - 8 x 10'' Easy-to-Use, 2 x 8 x 10" gray cards Accurate color balancing tool, Works with any film or digital camera, for JPEG and RAW files Can be used in pre- or post-production Gray side 18% reflectance, white side, 90% reflectance