We have the Barton Line Tamers (details from Barton here)
Available in dark grey or white £4.95 per pair.
Not on our website yet, but give me a call on 01256 478000 if this is what you're after. (Not sure if it is as the cord on these is not elastic)
We also now have the Barton Clamseal for £8.95 which is used to hold together small tears in tubes until a full repair can be made.