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Professional bartenders will usually choose a Boston Shaker set due to their larger capacity as well as being faster and more efficient to work with behind a busy bar. The shaker covered with rubber plastic grip to avoid frosty tin and get slipped.
Take the heel of your hand and smack it on the bottom of the tin. This should form a tight seal. You don’t need to hit the tin hard, just firmly. If you’re too aggressive, you can risk breaking the glass.
Brand: Monin