The Ouroboros represents the cyclical nature of the universe, where beginning meets end and end meets beginning, like day and night or inhalation and exhalation. It is also known as the serpent of eternity and also represents the interplay of darkness and light and constant transformation. Pin diameter: 25 mm Colors: gold and black Black rubber closure on the back. Worldwide shipping Due to the current situation, shipping may take longer than usual. USA/Canada: it can take up to 60 days