French whisk handle has rocks in it? I'm at a restaurant supply store and I'm looking to buy this heavy duty French whisk manufactured by the company WINCO and I'm shaking the handle and it sounds like there are small rocks or sand in them. 

They all have it. 

What's that about?
It could be sand, used to weight the handle. The weight is an important part of the design. I assume some manufacturers use sand instead of just thicker/heavier steel because it's cheaper and easier to manufacture.

For proof that at least some whisks are made like this, here's a whisk with Amazon reviews that mention sand and even a picture:



It's just inert weight. It's not going to come into contact with your food. I guess if you get a defective one and the handle comes open and dumps sand in your food, you'd have to throw it out, but otherwise it's not really anything to worry about.