Skulls have different meanings to everyone. From just being "cool looking", to the most common symbolic use of the skull is as a representation of death, mortality and the unachievable nature of immortality.
Skulls have been used as good luck charms in various cultures in the past as they are believed to ward off illness and guard against evil spirits.
Each person have their own reasons.
These are made with a strong, eco-friendly product called Jesmonite. Drop resistance, strong, and the skulls will outlast you. They are also paintable, with quality acrylic paints.
ALL skulls come waterproof sealed, with the ability to paint over it, but please re-seal it.