What's their name

in Workshop
About to start a new build with Di2
I worked on a bike a while back and the Di2 cables had sponge surrounds to cut out noise or rattles inside the frame .Seems a better option than tie raps as I usually do .
Do those things have a name and where are they available?
Many thanks in Advance for any info
I worked on a bike a while back and the Di2 cables had sponge surrounds to cut out noise or rattles inside the frame .Seems a better option than tie raps as I usually do .
Do those things have a name and where are they available?
Many thanks in Advance for any info
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And it can be found here https://www.ebay.co.uk/p/16025423631
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