Mouth Kazoo Metal Kazoos with Adjustable Tone | Beautiful Gift Box for Kazoo Present | Simplest Musical Instrument with Silicone Head Cover | Aluminum Kazoo for Adults Rotation Gear Adjustment: Adjust the tightness by rotating the gear to change the vibrating range of the membrane. By controlling breath while blowing, different tones can be achieved. High-Grade Material: Durable metal construction ensures long-lasting use. The body is made of high-quality aluminum alloy, resistant to rust and discoloration, with a comfortable grip. Simple to Play: No music theory or practice required. Easily master playing techniques by twisting the cap on the membrane to adjust tone. Just humno need to blow forcefully. Protect the Mouthpiece: Lightweight and portable design features a silicone head cover that protects the mouthpiece and maintains hygiene and safety. Meticulous Mouthpiece Slot Design: Prevents saliva from entering the instrument during play. The three horizontal grooves on the mouthpiece allow upper and lower teeth to grip securely, keeping the mouthpiece clean and functional.