Set of mini pneumatic retracts, scale struts, and wheels, by Sapac. They are from the RZ-180 retract set. They air up and spring down. They were designed for Sapac's small EDF's, but could probably be used in some of the small EDFs that are available now. New, never used. Main struts measure 3.5 inches long. Main wheels are 1 5/8 inch diameter. Nose wheel is 1 1/4 inch diameter.