8" funnel. Made of durable, food-grade plastic. The smooth inner surface makes it easy to clean and sanitize. And the stem fits easily into carboys but is wide enough to provide fast flow. Comes with a 4″ diameter, fine mesh straining screen, and the interior has a notch around the circumference where the screen rests securely. Fits best in 3-gallon to 6.5-gallon glass carboys.