This is the Tug-N-Back Writer T200B. Pull the string and the tension goes away, give it a gentle TUG and the string retracts. The Patented mechanism allows you to write with the pull of the string to mess up your otherwise perfect handwriting.
Belt slide clip, 24″ string, Perfect for attaching to a clipboard (See T200CBA), or sliding the clip into your purse or backpack. Available with optional double sided tape.