All of our essential oli necklace are made out of stainless steel.[Guaranteed to not fade or tarnish over time.] Diffuser pendant size: 20mm Dia. Chain length: 22" cable chain with lobster clasp. Essential oil size: 1/6 fl. Oil Ingretients: Certified organic oil (USDA Certified Organic) Gift set makes great a gift for birthdays, holidays, events, celenbrations, or just because. Package will include: an aromatherapy necklace, 5ml essential oil, a flannelette bag, 12 pieces multi-colored reusable pads and a gift box Ships same or next business day!