A Miami Dolphins Speed Replica Flash NFL Helmet hand signed by Zach Thomas. The item and signature are in excellent condition. Zach is a former football linebacker for the Miami Dolphins. He is a 7x Pro Bowler, 2x NFL Alumni Linebacker of the Year, and a Miami Dolphins Honor Roll. AUTHENTICATION: Your item is tagged with a SmarTag powered by Prova Technology, which gives you digital access to your items authentication records.