I went to the opening party of a Jaguar Land-Rover dealership. They gave me a cocktail set. Please look at the components here in the pictures.
I have 2 questions:
1) What is the use of the 2 black rubber balls that can be opened?
2) There is already a strainer on top of the shaker, so what would be the use of the 4-Prongs Stainless Steel Bar Strainer? Does it strain better than the strainer on top of the shaker?
I understand that if I use the 4-Prongs Stainless Steel Bar Strainer, I have to remove the cap of the shaker, I cannot use both strainers.