Our customers caught on before we did, and made it a top seller! This vessel is made of durable but always flexible silicone. Once filled, it can be squeezed for more accurate narrow pouring. The silicone also offers a very sure grip. And ingredients can be mixed right inside. Plus, the translucent sides let you watch what's happening. Freezer, Microwave and Dishwasher safe. Comfortable at 40 degrees below or 450 above. We think you'll love it!