The Express Whisk by Mastrad has by far the most amount of design put into it. For starters, it comes with an auto-whisking action that can be activated by pumping the handle. What’s rather interesting is the whisk’s shape-altering mechanism. A knob on the top of the whisk’s wire structure allows you to tighten or loosen a moving metal member that slides up and down the whisk’s shaft, changing the whisk shape from a narrow whisk, to a balloon whisk, to even a flat whisk. BUY NOW!