Content: 30 mlIsopropyl Nitrite - CAS 541-42-4Isopentyl Nitrite - CAS 110-46-3 This Rush Ultra Strong - Black Label is ultra x ultra strong, means ultra strong▓. Not for Beginners! It combines two of the strongest formulars in one ultimate formular, that gets released extremely fast and lasts for an extremely long period of time. Additionally, it uses a Power Pack Pellet. This pellet reliably prevents the aroma from being contained by incoming air after first opening. This way, your big Rush Ultra Strong - Black Label stays fresh, clean and ultra strong▓ even longer. If you are looking for an ultra strong aroma, ideal to be divided over a long period of time with a persistent high quality of the aroma, Rush Ultra Strong - Black Label is the best choice.