The North American Ranging Card is an analog ranging device. Seen here in Milliradians (.mils) are 34 common objects respective to North America (front) and their approximate height in inches. The back of the card features 24 of these products in a chart, illustrating their hieght in .mils relative to their distance in yards from the marksman. Measure the height of the object in your .mils scope, find the corresponding distance in yards on the chart and you have a ranging solution without lasers or batteries. The cards are made from scratch-resistant flexible plastic and fit in common magazine pouches. Sold individually and available in MOA as well. Combined with completed Homework or Extra Credit (see our Amazon Store) this is an analog ballistic solution that features no batteries or signature. Cards measure 6"x 2.625" and are made of flexible plastic material. They fit perfectly in a common magazine pouch and have a manufacture hole to be put on a lanyard or d-ring.