Here is the wing skid that protects your wing tip. This is not all. 
It was design to be removable. Some don't like to show their plane with wing skid on static display. You can remove skids and put in your tool box. 

The CMPro Giant Plane retracts are the perfect choice for all 120 class Warbirds offered by RC-Warbirds.

Replacement inserts for Model Aviation Products Wing Tip Skid.

The CMPro Giant Plane retracts are the perfect choice for all 120 class Warbirds requiring rotating retracts (Corsair, P-40) offered by RC-Warbirds.

AirPower Oleo Legs Silicone Oil Kit (#10000 / 50 ml)

Airpower RA-250 Trunion Adapter for 3/16'' Wire Struts

The JTM Hawk & L-39 Retracts are specially designed for the JTM Bae Hawk, T-45 amd L-39 90mm full composite EDF Jets. 

The HET-RC L-39 Retracts are specially designed for the HET-RC L-39 Albatros composite EDF Jets.

The MAP Micro Air Retract system is the long awaited solution for larger electric scale planes and EDF Jets.

AirPower Models are pleased to present their all new retract units. 
Made from Anodised aluminium these units feature air up and air down operation and are intended to use in models from 9kg / 20lbs up to 20kg / 45 lbs in weight.