Amazon.com: D-Line White Cable Tube, 3' 7" Flexible Cable Management Sleeve, Wire Organizer to Hide Cords from TVs, PCs and Games Consoles - 1.25 Inch Diameter - 43 Inch Length : Electronics
7-pin XLR Tube Mic Cable – Microphone-Parts.com
BLACK PVC Sleeve Wiring Harness Loom FLEXABLE Wire Cover TUBE CORD PROTECT LOT Diameter for 1/4" 1/2" 3/4" Size Choose - Walmart.com
Central Loose Tube Fiber Cable
Side-light Fiber Optic Tube - 4mm Diameter - 1 meter long : ID 4163 : $7.50 : Adafruit Industries, Unique & fun DIY electronics and kits