Bowdenzug Graupner 3507 Pack of 2. 1000 mm long, inner tube 1.85 OD, 0.9 ID, special plastic. Extremely temperature-stable, hence no unintentional alteration of control surface deflection by fluctuations of length. One end equipped with threaded bushing M 2. PVC outer tube, 3.2 OD, 2.2 ID.