Blends poll pressure with leverage to create a gentle gag effect. Brass alloy promotes salivation. The thickness of the mouthpiece measures 14mm. Cheek height options available: 115mm (4.5", 5") and 130mm (5.5", 6"). Mouthpieces crafted from brass alloy combine copper with a tougher metal, resulting in warm, durable options that enhance salivation. Stainless steel is chosen for the cheeks because of its durability, ease of cleaning, and resistance to rust.