International Free Agency -- Cuba (Professional)
Definition
While most international free agents from Latin America sign as amateurs during their teenage years, Cuba has its own top professional league: the Cuban National Series (Serie Nacional). Players with enough experience as a professional in Cuba are exempt from MLB's international bonus pools.
Any player 25 years of age or older with at least six seasons in Serie Nacional is considered a professional rather than an amateur. These players may sign a Major League or Minor League contract with any team for any amount, just as a domestic free agent would, without penalty for the signing team.