Federal Syntech Action Pistol, 40 S&W, 165 Grain, Total Synthetic Jacket, 50 Round Box AE40SJ1 The exclusive polymer coating in Syntech(R) prevents harsh metal-on-metal contact between the bullet and bore, eliminating copper and lead fouling. Combined with clean-burning powders and the Catalyst lead-free primer, Syntech loads keep your gun cleaner, longer, so you can shoot more-and shoot better.