Often referred to as “silent” or “mushroom” piston and cylinder heads this design provides a more aerodynamic airflow path. It's effectiveness of silencing piston impact is questionable at best although it does have a rubber bumper on both the cylinder and piston head so it is slightly better than a flat piston head although still not as good as a sorbo pad due to their much softer material of the sorbo pads. As of yet I haven't seen any side by side tests to confirm how effective this cylinder head design is but in theory there is an advantage.
Cylinder head type: V2
Material: Aluminum and rubber
Piston head thrust bearing: Yes