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Cocktail Shaker
You’re going to need a cocktail shaker. Avoid anything plastic or cheap. Look online or at a restaurant supply store for a legitimate shaker that resembles the ones you’ve seen at the bar. You can search Amazon for weighted tin shakers. Shaken cocktails need to be shaken vigorously, so invest in a nice shaker. The shakers with built in strainers aren’t very professional and they tend to leak. There are ones that fit with a pint glass, or ones that have their own steel tin top.