This PSA/DNA authenticated and encapsulated Zack Greinke signed card has been hand signed by Kansas City Royals legend, Zack Greinke. It has been authenticated by PSA/DNA and comes encapsulated in their tamper-proof holder. This Baseball trading card would be a great addition to any MLB Memorabilia collector. This item ships same day. Backed by Prime One Sports 100% Money Back Guarantee.