The American Stockman Big 6 Salt Block is a 50 lb, extremely weather-resistant pressed mineral block that is excellent for weight gain, feeding efficiencies, and overall herd performance.  

The Big 6 contains the 6 core micro minerals:  

Zinc 
Manganese 
Cobalt
Copper
Iodine
Iron  

Features:  

Salt Min: 96%
Salt Max: 99%
Zinc Min: 320 ppm
Iron Min: 2400 ppm
Manganese Min: 2400 ppm
Copper Min: 260 ppm
Copper Max: 380 ppm
Iodine Min: 70 ppm
Cobalt Min: 40 ppm.