Individual slots hold up to 50 rounds of ammo securely in hard-shell plastic ensuring the safety of your ammo with a flip top lid for easy access. Small – Holds 50 rounds 9mm, .380 Auto. Medium – Holds 50 rounds .357 Mag, .38 Special, .38 S&W Large – Holds 50 rounds .41 Mag, .44 Mag, .45 long Colt X Large – Holds 50 rounds .45 ACP, .40 S&W, 10mm