Need shield cover for RF cable

In my cabinet, there are many RF cables, say normal RF blue cables that can support to more than 10GHz. And I don't want them touch each other between two cables. The RF cables have shield layers. But I think that's not enough. So I need a shield cover for RF cables, which can:
1. provide more EM shield functions
2. provide more insular layers.
Who can suggest some part numbers?
thanks.

try this:
microwave absorbing material - ARC Technologies - radar absorbing structures

Often you do not want to add more metal shielding, but want to absorb the standing waves and currents leaking onto the outside of the braid.

Thanks, biff44,
But I am curious about the absorb ability. There is a figure in the link you provided.
Say the 1mm, can I say the absorb ability is -11dB at 4GHz? The figure is travelling wave loss dB/foot vs. freq.

I always use several ferrite clamps on each coaxial cable. Heavy rigid cables as well as RG-58. In my business is it a rule.
http://b-dig.iie.org.mx/BibDig/P02-1520/docs/p006.pdf
http://www.tdk.co.jp/tefe02/e9a15_zcat.pdf
Vector network analyzer calibration, AnTune

Yep, ferrite beads work too.

For a signal to get from cable A to cable B, there has to be some sort of leakage (bend in the cable where the braid opens up a little, etc) on BOTH cables. And even then, you will not have much leakage dB wise UNLESS those two leakage holes are N x λ/2 apart, where they set up a resonant standing wave. If you can kill the standing wave...your leakage will be way down in the mud.