This Full Size Pittsburgh Panthers Authentic Helmet has been personally hand signed by NY Jets Hall of Fame Running Back Curtis Martin in bold BLUE Paint Pen. This item was signed in the presence of and witnessed by a representative of Professional Sports Authenticator (PSA/DNA). It comes with an individually numbered, tamper evident sticker from PSA/DNA which can be reviewed online to ensure authenticity. This process helps to ensure that the product purchased is authentic and eliminates any possibility of duplication or fraud.