Made of durable, sturdy glass. Easy to read ingredient quantity marks molded into the side of this glass bowl. The silicone lid can be placed on the pan when proofing dough, such as pizza crusts and rolls. Also helps keep the bowl clean when the stand mixer is not in use. The molded pouring spout makes pouring batters easy, minimizing spills and drips. This unique glass bowl base secures the bowl to the stand mixer.