The product is a hardback book titled "Messi: Guillem Balague's Biography of The World Cup Champion" signed by the author. This book falls under the category of sports memorabilia, specifically football memorabilia. It is an original piece, offering a unique insight into the life and career of football legend Messi. This book is a valuable and collectible item for fans of football and Messi, making it a coveted addition to any sports memorabilia collection.