Galaxy S9 has Glass front(Gorilla glass 5), glass back(Gorilla glass 5), and aluminium frame. It's a Super AMOLED, HDR10 with a dimension of 147.7x68.7x85mm. It has 5.8 inches, 84.8cm (83.6% screen to body ratio), with a 3D Touch (home button only) and always on display. It's IP68 dust/water resistant is up to (1.5m for 30 min).