Quantegy 456 Reel to Reel Tape - 1/4" x 600', 5" Plastic Reel Grand Master studio mastering audio tape. The professional standard for the audio recording industry. Quantegy 456 Grand Master has produced more No. 1 hits and gold albums than all other tapes combined. The professional recording industry has chosen its sonic superiority, consistent performance and reel-to-reel consistency in studios around the globe. Quantegy 456 Grand Master continues to be the worlds most widely used analog tape, from studio recording to broadcast radio. Product Features: Industry Bias Reference Standard; Reel-to-reel consistency; Elimination of transit errors; Available in 1/4" width Standard Width 1/4" 0.246" (6.3 mm); Magnetic Properties: Coercivity 320 Oe (25.5 kA/m); Retentivity 1500 Gs (150 mT); Nominal Thickness: Base Film 1400 " (35.4 m); Oxide Coating 500 " (12.7 m); Backcoating 30 " (0.8 m); Total 1930 " (48.9 m)