This Autographed Auto Grade Gem Mint 10! 2019 Panini Contenders Optic Superstars Red Cracked Ice #4 Card has been Personally Signed by Giannis Antetokounmpo of the Milwaukee Bucks. This item is 100% Authentic, it comes slabbed and authenticated by Beckett Authentication Services. The authenticity can be verified on Beckett Authentication Services website.