Featured is a Kristaps Porzingis signed Boston Celtics Nike Swingman jersey. This jersey has been hand signed by Porzingis and comes with the PSA hologram. This jersey is size 48. This jersey would make a great addition to any sports memorabilia collection!. SPECIFICATIONS Autographed By: Kristaps Porzingis Team: Boston Celtics Sport: Basketball Authentication: PSA/DNA Authentication Services