Air Knight 12Expand Eternal is a premium Stamina-type Beyblade from the Burst Turbo series, engineered for extended spin duration and superior stability. The Air Knight K4 layer delivers consistent performance, while the 12 Disc provides optimal weight distribution for sustained rotations. The Expand Disc Frame enhances balance and control, and the Eternal Performance Tip ensures smooth, prolonged spins across various stadium conditions. Ideal for competitive players seeking reliable stamina-focused gameplay and tournament-grade durability.