X-Man Spark 7×7 V2 (Magnetic + Ball-Core)
QiYi’s flagship 7×7 under the X-Man name. The V2 adds a ball-core corner-to-core system on top of the piece magnets, which is what keeps a puzzle this size from flexing itself out of alignment halfway through a solve.
Big cubes live or die on stability, and this one holds its shape when you push the turning speed. Corner cutting is generous for a 7×7, and the layers track straight instead of wandering.
Stickerless. This is the one to buy if your 7×7 keeps locking up on you.
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