The Pro’s Preference
This is an upgraded version of the Boston shaker. And it's what you're most likely to find professionals slinging at any respectable establishment. Koriko's is the industry standard because it's lightweight and durable. It offers quick chilling, a near seamless interior to reduce unwanted ice chipping, and an expanded distance for ingredients to travel within, but it can be tricky to use—especially for amateurs.
Set of weighted shaking tins,
$23.98 by Koriko