The Black 4.0 CFexpress Type B memory card from Delkin Devices combines reliability with unmatched performance. Offering some of the fastest sustained write speeds, the Black CFExpress Type B card is specifically designed to excel in the latest generation of high end cinema presenters. Capable of offloading data at speeds up to 3530MB s, Black CFexpress Type B 4.0 ensures the fastest, most efficient data transfer from card to computer for instant access to your files and sooner post production start up time. This is ideal for photographers and videographers who need to quickly offload and resume large amounts of data.