Rubber motor winders for F/F balsa model airplanes are in good condition, turn ratio is marked on the white one.

 One is a Peck Polymers and the other is unbranded. Both turn and seem to work fine. 

These winders came from the estate of a long time modeler so I have no history on it. Selling "as is" to the best of my knowledge and what I can see. Many more engines to list, so come back often to see new listings. Shipping is to the lower 48 states only, thanks for looking.