The Oxy-gen air freshener refills system offers air freshness technology that is unparalleled. By harnessing pure oxygen, this system means continuous neutralising of the air. It also adds a fresh, clean scent, and there are several fragrance options. There are 30ml of fragrance in every refill, and you will not find any solvents, propellants, or emissions to worry about. 7 different unique Scents available with fresh and colourful fragrances of varying intensities. Each refill contains 30ml of pure fragrance and is guaranteed to last for 60 days. Scent: Spa. Strength Level: Level 3. Size: 30ml