Straight from the website.
Crossover Service (Cards) Cards graded by other third-party firms may be submitted in their holders for PSA grading. This service is available under all service levels. PSA will evaluate the card inside the current holder. If PSA deems the card worthy to cross over into the Customer’s specified minimum grade, the card will be removed from its holder and placed into a PSA holder. Customers using the Crossover Service must provide a minimum grade on the submission form.
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