Amazon.com: Quantegy 456 Reel to Reel Tape - 1/4" x 600', 5" Plastic Reel: Electronics
This tape is really nice. It has a black backcoating, so that it is easy to see white pencil for splicing. It is thick, which lowers wow and flutter, and makes the tape stronger. Also, the tape is really smooth and plays well. The audio quality is superb....