This card is sized to fit into a wallet, buttpack pocket, or any other small area that is easily accessible. The card roughly the size of a standard US business card and is laminated in 10 Mil laminate for extreme durability. There are spaces for elevation data and by using a sharpie you can fill in the data specific to your rifle and load combo. A sharpie will stay permanently, even in rain and water, until you write over the sharpie with a dry erase marker, which will then erase it.
There is a second column of elevation data in order to allow recording different zero data points for various locations or areas of operation. For example, your normal home base is at 3200 feet and typical temps are 70, but if you are now operating at 5000 feet and 100 degree temps, you can record your data for both and easily reference them.
Various Ranges are available, default is 100-1100 yards/meters