The Official Nintendo GameCube Black Memory Card 251 Blocks (DOL-014) is a genuine OEM product manufactured by Nintendo in Japan. This external attachment is designed specifically for the Nintendo GameCube platform, with a storage capacity of 251 blocks. It is compatible with the Nintendo GameCube console and memory cards, making it a reliable choice for gamers looking to expand their storage options. The black color adds a sleek and stylish touch to the memory card, while the California Prop 65 Warning ensures players are aware of potential health risks related to ingesting the product.