I was having a hard time finding a skid for the Skyliner that both protected the arm of the quad, and lifted the quad off the ground a little. Rotor Riot has an STL posted for an arm guard, but the bottom is flat, and traditional skids do not protect the arm tip when the quad is crashed. This skid will both protect the arms tip and the bottom of the quad. I printed mine out of TPU and it works well for me.