I found this 6 foot one on amazon. My cat has laid on it and tugged at his with his claw and it's still fine.
https://www.amazon.co.uk/Pawhut-Out...d=1&keywords=6+foot+run&qid=1591737517&sr=8-1
https://www.amazon.co.uk/Pawhut-Out...d=1&keywords=6+foot+run&qid=1591737517&sr=8-1