Large Brush Grommet

Putting in a new counter top, on a built in desk. Walls on back and sides. Old top had a large hole to run wires down to the computer, power, etc. I would like to leave the top approx. 1 inches away from back wall to easily drop wires down. Im looking for some suggestions on a material to fill that gap? Something like foam or rubber that could easily be slit, and a wire could be fed thru it. The best material for this space is a very course thick bristles like are used in tooth brushes. The bristles should stop something from falling through the crack but be flexible enough to force a wire through by hand.
Any suggestions on where to buy 8 feet of this bristle? Here's an example ( not that I want to buy 8 on em: http://www.rockler.com/ecom7/product_details.cfm?&offerings_idS86
Thanks TP
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TP wrote:

There is a brush type floor sweep weather stripping that is used to seal the bottom of doors. The link below is to a .PDF catalog (upper right hand area) by the K. N. Crowder company who is one of the manufactures of this type of product. Look at items W-24S, W-33S and W-24S on page 19 of the .PDF file.
http://www.kncrowder.com/wstripping /
-- Jack Novak Buffalo, NY - USA (Remove "SPAM" from email address to reply)
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Take a look at the brushes for passage doors.
UA100
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I think having a 1 1/2" - 2" gap running along the back would be much more attractive then that brush stuff. You could put a small piece of edging that is proud of the top by 1/4" to keep pencils, etc. from rolling off.
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