Polar Pro Slate Holder Designed to offer maximum protection against more challenging and demanding shoot locations, Slate’s premium cast aluminum case provides you with efficient access to your memory cards. Inside of Slate’s rugged exterior is a custom-cut injection molded insert allowing you to securely store up 24 memory cards. When empty, Slate is a blank palette to begin creating your content upon. When full, Slate offers peace of mind, knowing the content you have captured is compiled in a premium safe, single location.