The DIY Base Vapor Flavour is probably the best base available on the market.

This DIY Base 50ml 10/90 is made in Switzerland, the perfect compromise between flavors and steam it is composed of 10% propylene glycol and 90% vegetable glycerin and provides a hit in throat and will fit the majority of sprayers and clearomizers.

This 50ml bottle is ideal for adding base to longfill e-liquids.