Robart #652 3/8" (9.5mm) diameter RoboStruts are the best replacements for wire landing gear. They are suitable for most airplanes weighing 5 to 12 pounds (2 - 5.5 kg). With real functional oleos and torque links, they can be used on grass or paved airfields.

Length: ~16.8cm;  Axle: ~4.8mm (3/16")