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SKE Crystal Sour Blueberries is the perfect premium sour tart blend vape flavour that captures a natural tasty blueberry flavour with a topping tart cover at the right balance mixture. Crystal SKE disposable devices have 2% nicotine or 20mg nic salt and a concentration ratio of 50% VG (Vegetable Glycerine) and 50% PG (Propylene Glycol).