My Personal preference. Probably because it was what I was trained with and I’ve never really strayed away from it! Made up of the Stainless steel tin and the thick-bottomed glass, you always build the cocktail in the glass part, fill with ice then cap with the steel end and shake. The glass is more reinforced than a normal drinking glass so don’t be shy about giving the steel top a healthy whack when you put them together. When correctly fitted there should be a flat edge on one side where the glass and steel ends meet and the other side will look more “wedged in”. This is fine and completely normal, but do make sure that it is sealed otherwise you will know all about it when you start to shake… Always shake with the glass pointing behind you and the steel end pointing “out”, then to separate the two simply hold the shaker glass up with the flat edge furthest away from you. With the heel of your hand give the steel a good whack at the point about a centimetre away from the flat edge – where the glass is closest to the steel without actually being flat to it. (Don’t worry I’ll post pictures! It’s not nearly as complicated as it looks!)