WARNING: Discharging firearms in poorly ventilated areas, cleaning firearms, or handling ammunition may result in exposure to lead and other substances known to the State of California to cause birth defects, reproductive harm, and other serious physical injury. Have adequate ventilation at all times. Wash hands thoroughly after exposure. For more information go to www.p65warnings.ca.gov/.
It's the cleanest-burning muzzleloader primer ever produced. Designed to burn extra-hot, they help keep the flash-hole clear for extended shooting between cleanings.