The Roma is designed with natural stone, and raw wood diffuser beads. Stones are 8mm in size and can be stacked with other designs or worn alone. Each design is made with 1mm stretch cord that gives strength and allows for stretch. Simply add 1-2 drops of essential oil to the raw rosewood diffuser beads to enjoy the aromatic benefits throughout the day. Re-apply as needed. Each design is individually tagged to allow retailer to price.