Effective Ear Pressure Equalization: This diving tool creates a sealed chamber filled with air in the oral cavity, helping balance pressure by lifting the Eustachian tubes and allowing air to enter the middle ear. Aluminum Alloy Material: Made from premium aluminum alloy, this equipment is lightweight yet sturdy, providing exceptional durability with erosion resistance and rust prevention. Stable Grip: The specially designed groove enhances grip, enabling a more stable and secure hold during underwater training, enhancing control and confidence. Lightweight Design: The lightweight construction ensures ease of use and portability, making it an ideal companion for divers. Durable Performance: The anodized surface treatment ensures long-lasting performance, making it suitable for various diving conditions. By performing a series of actions such as pinching the nose, closing the glottis, and controlling tongue position, this ear pressure balance diving tool creates a sealed chamber filled with air in the oral cavity. By exerting pressure on the air inside the mouth, it helps balance pressure by lifting the Eustachian tubes and allowing air to enter the middle ear via the pharyngeal cavity. Made from premium aluminum alloy, this diving ear pressure balance equipment is lightweight yet sturdy, providing exceptional durability. Its surface is treated with anodization, offering erosion resistance and rust prevention, ensuring long lasting performance. The specially designed groove in the middle of this ear equalization training tool enhances your grip, enabling a more stable and secure hold during underwater training. Experience enhanced control and confidence while practicing diving skills. Color: Black Material: Aluminum Alloy Package Contents: 1*Ear Equalization Training Tool 3*Balloons Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from th