Foreign workers migrate to the Middle East as contract workers by means of the "kafala", or "sponsorship" system. Migrant work is typically for a period of two years. Recruitment agencies in sending countries are the main contributors of labor to GCC countries. Through these agencies, sponsors must pay a fee to the recruiter and pay for the worker's round-trip airfare, visas, permits, and wages. Recruiters charge high fees to prospective employees to obtain employment visas, averaging between $2,000 and $2,500 in such countries as Bangladesh and India. Contract disputes are also common. In Saudi Arabia, foreign workers must have employment contracts written in Arabic and have them signed by both the sponsor and themselves in order to be issued a work permit. With other GCC countries, such as Kuwait, contracts may be written or oral.