White Howlite Stone Plugs : Our White Howlite Stone Plugs are a crisp white with variations of black to gray lines and patterns. It is a calming stone known to reduce insomnia and perfect to use during meditation. These plugs are made of 100% natural stone. This is also the reason why each and every plug is unique, but rest assured that we’ll give you a matching set. Double Flared and available in sizes 8g – 2”.