Pete Alonso, the Mets' rookie first baseman, donated his 9/11 tribute cleats that he and his teammates wore on the 18th anniversary of the terrorist attacks to the 9-11 museum on Oct. 1, 2019.

Credit: Charles Eckert

The 9/11 tribute cleats wore by Mets All-Star first baseman Pete Alonso sits on tissue paper after being donated to the 9/11 Memorial & Museum on Tuesday, Oct. 1, 2019. Alonso wore the cleats during a game on the 18th anniversary of the 2001 attacks.

Credit: Charles Eckert

9/11 Memorial & Museum President Alice M. Greenwald, left, smiles as Mets All-Star first baseman Pete Alonso, right, holds his 9/11 tribute cleats after donating to the museum on Tuesday, Oct. 1, 2019. Alonso wore the cleats during a game on the 18th anniversary of the 2001 attacks.

Credit: Charles Eckert

Mets All-Star first baseman Pete Alonso, right, holds his 9/11 tribute cleats after donating them to the 9/11 Memorial & Museum on Tuesday, Oct. 1, 2019. Alonso wore the cleats during a game on the 18th anniversary of the 2001 attacks.

Credit: Charles Eckert

Mets All-Star first baseman Pete Alonso, right, hands a baseball bat to 9/11 Memorial & Museum President Alice M. Greenwald, left, on Tuesday, Oct. 1, 2019.

Credit: Charles Eckert

Mets All-Star first baseman Pete Alonso, center, hands his 9/11 tribute cleats to 9/11 Memorial & Museum President Alice M. Greenwald, left, on Oct. 1, 2019. Alonso donated the cleats he wore during a game on the 18th anniversary of the 2001 attacks.

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