Ⓐ Front & back: Lightweight impact-absorbing material as main structure.
Ⓑ Side wall: Lightweight impact-absorbing material + high density foam to deflect side impact.
Ⓒ Head & bottom: lightweight impact-absorbing material + high density foam + HDPE panel act as a cage that prevents from crushing.
Ⓓ Fixed Neck Brace System keeps your instrument stabilized.
Ⓔ Bottom pad: One detachable bottom pad provided, which has two sides of different thicknesses. The thick side downward can adapt to fit symmetrical guitar body like Kiesel; the thin side downward can fit a dissymmetrical body like Strandberg. Also, it is up to you to remove the bottom pads regarding the size of your headless guitar body.