These are various O-Rings required to keep your hookah sealed and functioning perfectly. Each O-Ring is for a different part of your hookah.
OR1901 - Clear O-Ring 15mm - For 2.0 Hose Adapters, Plugs, and Pressure Relief Valves
OR1902 - Clear O-Ring 22mm - For Bowl Adapters
OR1903 - Black O-Ring 17mm - For Hose Handles (Ghost and Dagger Styles)
OR1904 - Clear O-Ring 52mm - For Small/Medium Hookah Hearts
OR1905 - Clear O-Ring 62mm - For Large Hookah Hearts