Delkin eFilm Secure Digital PRO Cards are designed to be fast and durable for extensive shooting in the most extreme conditions. They are completely Solid-state, feature a built in write protect switch that further ensures the safety of your data, and are optimized for use in professional grade SLR digital cameras. eFilm Secure Digital PRO Cards are made with premium materials and assembled in the U.S.A. Furthermore, to ensure the highest quality possible, Delkin's memory cards are put through several rigorous quality assurance tests before being released to the consumer.