Cafe Brew’s 12 Cup Glass Stovetop Whistling Kettle is perfect for use on Electric, Glass Cook-Top, and Gas Ranges. Our Whistling Stove Top Tea Kettle is made from High Quality Borosilicate Glass from DURAN, Germany. Cafe Brew’s high quality Stove top tea kettle is Assembled in USA and is BPA Free. Our Glass stovetop tea kettle has a 48 oz capacity with measurements based on a 4 oz cup. The typical yield is twelve 4 oz cups. Our stovetop tea kettle is Dishwasher Top Rack Safe for easy cleanup and ease of use.