The MC-CF660G is a high-speed Nikon 660GB CFexpress memory card (Type B) for use with CFexpress compatible cameras. The card features a fast read rate of up to 1700MB/s and a write speed of up to 1500MB/s. The card is optimized for the intensive video and still shooting requirements of high performance cameras like the Z 9 flagship mirrorless camera. CFexpress is a trademark of the CompactFlash Association in the United States and other countries.