The product is a vintage Great Rocket's Mewtwo promo card from the Pokémon Trading Card Game, manufactured by Nintendo in 2001. The card is a Japanese-sized card stock featuring the character Mewtwo in a holo finish. This rare promo card, illustrated by Shin-ichi Yoshida, is part of the Game Boy GB Promo set and is a sought-after collectible for Pokémon TCG enthusiasts.