This is a fundamental building material for use in scratch-building or customizing models.
This is a set of parts to create flexible pipes ("flesh"-colored, no less!). This is the "large" set, featuring sections that measure 4.5mm long and 5mm wide, with separate ball joints that measure 3mm long (when combined, each pipe section with ball joint installed will measure 7.5mm long). No stats are available on how long they'll be when all joined together, but you get the idea.