Mr.Suave

well they're used for keeping the wires together and so make them look neater. umm im not sure how you put them on but i think you either wrap them on or just slide the cable in. i kno someone posted a pic of their comp with sleeves in(i think) in the "Post A Pic Of Your Pc Here " thread.
here http://computerforum.com/showthread....094#post198094 its the post by SERprise, 1st and 2nd pic show it, i think.

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The Comp:
CPU--Athlon64 X2 4200+ Manchester @ 2.5!!!:D
HDD--WD Caviar 250GB 7200 RPM SATA
MB---DFI LANPARTY UT nF4 SLI-DR
RAM--OCZ Titanium 2GB (2 x 1GB)
GPU--Sapphire ATI Radeon X1900XTX 512mb
SPU--Creative Sound Blaster Audigy2 ZS
PSU--ENERMAX Whisper II 535W
all inside a Thermaltake Matrix VX