sonic fabric - the invention of conceptual and sound artist "alyce santoro":http://www.alycesantoro.com - is a durable, beautiful, audible textile woven from 50% recorded audio cassette tape and 50% colored polyester thread. the fabric is woven in new england, and small, limited-edition accessories are hand sewn in manhattan by designer "julio cesar":http://www.juliocesarnyc.com. sonic fabric emits a garbled, underwater-like sound if you run a tape head over it (for a demo, please visit youtube channel "alyceobvious":http://www.youtube.com/alyceobvious).this "edition" of sonic fabric (the sound recorded onto the tape before weaving) consists of a single note: 136.1Hz, or the "om tone". more info at "sonic fabric.com":http://www.sonicfabric.com/sound_video.htmllooks equally great with dress shirt or t-shirt.all sonic fabric products are guaranteed to be good-vibe emitting.the ties come in two colors: dark brown (woven with brown tape and black thread), and black (black tape, black thread). each comes packaged with descriptive insert and instructions for crafting a "reader" device from a hacked personal cassette player.