LEGO part x334c01 - White Technic, Axle Flexible 26L (Axle 2L and 4.5L Ends) with Dark Gray Cable at BrickScout
LEGO Sets with Part 32201 Technic Axle Flexible 14, Hose Soft
Amazon.com: KonHaovF 116PCS Gear and Axle Set for Technic Parts Compatible with with Major Brand Technic Parts, DIY Gears Assortment Pack(Gears Pins Axles Differential New) for Technic Building Blocks Set : Toys