X-Man Spark 7x7 V2 M (Ball-Core)

The X-Man Spark 7x7 V2 M is the world's first mass-produced 7x7 with a ball core. The added corner/core magnetization gives this puzzle more stability than in other big cubes. If you're a fan of 7x7 as an event, or you just like notable puzzles, the Spark 7x7 V2 M is the perfect choice!