Here you can find heatshrinks and braided sleves ("snake skin") of different sized for DIY cables.
Colored Flexible Polyolefin, 2 to 1 Ratio Heatshrink, different colors
Braided Sleeve for Power Cables, 1/2"=12.7mm, select colour, by 0.5m
Satori TW29BNWG-4 Beryllium Dome Tweeter
Sonnet Audio mono power amplifier
Sonnet Hermes Digital to Analog converter with Volume control.