Precisions engineered 7 inches aluminum empty reels ensures compatibility with 1 / 4 inches reels to reels tape recorders, enhanceds sound fidelitys during and playbacks for sound, vintage sound enthusiasts, and studio professional components for restoring or maintaining tape baseds systems as direct replacement for worn out reels, its aluminum structure minimizes rotational inertia while maintaining legacys of precisions in professional sound equipment Featuring NABs hubs with 3 hole resistant and aluminum construction, this reels superior bend resistance and strength for professional tape handling for studio, archival transfers, or daily operations with reels to reels machines like Roar, ensuring smooth rewinding and tape management