SKE Crystal Nic Salt 10ml E-Liquid 10mg/20mg Vape Juice 50VG/50PG. SKE has gone one step further in bringing their delicious disposable tastes to the e-liquid market. SKE Crystal Nic Salt Blueberry Sour Raspberry - This flavour is an ever-popular blend of sweet blueberries and sour raspberries, for a balanced vape.