The Job Mastery Rewards in Mafia Wars: Cuba are items which can be used in fights rather than items with passive bonuses.
El Soldado (Tier 1) reward: El Rey Roadster
Vehicle: 40 Attack, 34 Defense
El Capitan (Tier 2) reward: Guerilla Commando
Armor: 38 Attack, 35 Defense
El Jefe (Tier 3) reward: Avispa Machine Gun
Weapon: 54 Attack, 24 Defense
El Patron (Tier 4) reward: Che's Beret
Armor: 46 Attack, 34 Defense
El Padriano (Tier 5) reward: Cocodrilo APC
Vehicle: 42 Attack, 56 Defense
El Cacique (Tier 6) reward: Cazador Assault Rifle
Weapon: 60 attack, 25 defense
And that's all the tiers. The rewards are a little disappointing - they do not really do much! Five total items is just a drop in the bucket when you can fight with 501 weapons, armors, and vehicles.