Glaser Safety Slug(R) is designed as a pre-fragmented projectile using a traditional copper jacket. Instead of a solid lead core like conventional hollowpoint ammunition"" it has a compressed core of lead shot. It's capped with a polymer ball that ensures flawless feeding and rapid follow up shots. Glaser Blue is filled with a compressed load of #12 lead shot. Glaser Blue is perfect for warm weather climates when light clothing is the norm.