The product is a Christopher Sabat signed Black Clover Yami Funko Pop 1423, authenticated by James Spence (JSA). This personalized item is an original autographed piece from the movie Black Clover, featuring the signature of the actor who voiced Yami Grimm. The autograph is accompanied by personalized instructions, including the phrases "Dark Magic," "Dark Cloaked," and "Dimension." This unique collectible is sure to appeal to fans of the anime and movie series, offering a special piece of memorabilia that showcases the authenticity and significance of the signature.