Purchasing this will give you 1 Key for the PvP Crate on Both Prison and SMP

PvP Crate Items include the chance of getting: 

Enchanted Iron Sword (Sharpness 1-5, Unbreaking 1-3), Diamond Sword (Sharpness 1-5, Unbreaking 1-3), Diamond Armor (Protection 3, Unbreaking 2).