The Glaser Blues are intended for use in most self defense situations. They consist of a thin copper jacket into which a mass of #12 shot is compressed. The bullet stays in one piece until it strikes the intended target; then the jacket peels back and the shot spreads out inside the target. This produces tremendous stock and tissue damage without endangering innocent bystanders. The Silver is constructed in the same manner as the Blue except they contain #6 shot and will penetrate 2-3 inches deeper than the Blue. We recommend this load for those climates in which you might need to defeat 3 or 4 layers of heavy winter clothing.