No. Select is a finished 10ml nic salt, ready to vape. Only the shortfill ranges need a nic shot.
Add any five 10ml bottles on the deal to your basket and the price drops automatically. Mix flavours, strengths and brands freely.
The rest of the Imp Jar catalogue is 0mg shortfills you mix yourself. Select skips that step. Open it, fill your pod, done.
Because it is a salt rather than freebase, 20mg stays smooth instead of catching in the throat. That is what makes it work for people coming off disposables, who are used to that strength.