Delkin Secure Digital High Capacity (SDHC) PRO Cards are designed to be fast and durable for extensive shooting in the most extreme conditions. Optimized for use in professional grade SLR digital cameras, this SDHC Class 6 PRO 4GB capacity card has a speed rating of 150X, and is designed to be fast and durable for extensive shooting in the most extreme conditions, and it comes with a Lifetime Warranty.