A real pro cocktail shaker set that is now most commonly being used at home bars and professional bartender is a Boston Cocktail Shaker.
Here are few considerations to choose the Boston Shaker Set:
1. Weight of the Tins (2 Tins to be 400 gram or more) & the volume of the tins - 28 / 18 Oz
2. Should be made of 304 Stainless Steel
3. Should come with some weighted accessories that helps in straining like - Hawthorne, Julep or Fine Mesh
Thanks
Mohit