Mudflaps wire in Canvas?

[Grant Bowker]

Is it anything like the core from clothesline? (the old style between two pulleys, not the yuppie umbrella style) That was a twisted wire core that I remeber as being quite stiff to bend and springy. The plastic covered versions would also reduce rust marking of the canvas of the mudflap, I think it was also made as galvanized to reduce rusting.