Each has a solid surface and a core of heavy metals.
None have rings.
If we could weigh these planets, we'd find they have a high density for their size. In other words, they're heavy. Jupiter, Saturn, Uranus, and Neptune are known as the gas planets because they are large spinning bodies of gases with no solid surfaces. These planets are located far from the Sun, and have rings made of rock, ice, and dust. If we could weigh these large planets, we'd find they have a very low density compared to their gigantic size.