A type of fabric tape with rubber adhesive that only sticks to itself. Sold in rolls 3/4" wide by 60' long, it is the preferred tape for looming, hodding, or bundling cables together.
http://multimedia.3m.com/mws/media/762753P/3m-temflex-cotton-friction-tape-1755.jpg?boundedSize=310
http://multimedia.3m.com/mws/media/762753P/3m-temflex-cotton-friction-tape-1755.jpg?boundedSize=310