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Since he was 3 years old, Brady Kahle has collected baseball cards. Then, after two of his friends were diagnosed with cancer, Kahle started selling off his collection to raise money for their support.

Since February 2016, Kahle has raised more than $13,000, WWLP reported.

“I just had a lot of baseball cards and I wanted to help them out,” the Springfield, Massachusetts, boy told the news station.

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In December 2015, Kahle’s friend Peter Manzi was diagnosed with leukemia. Landen Palantino, 8, was diagnosed with glioblastoma brain cancer in January 2016, MassLive reported.

“It’s gone around the world; we’ve had donations from France, Mexico, Canada,” Jim Kahle, Brady’s grandfather, told WWLP.

Last fall, Brady was honored with his own baseball card from Upper Deck as part of the company’s Heroic Inspirations campaign, MassLive reported.

Brady sells his collection of cards— and his own Upper Deck cards— at the Chicopee Boys & Girls Club card shows at his booth, “Cards for a Cause.”