This trumpet mouth exerciser, according to the principle of trumpet mouth and breath forward, lip concentration and mouth closing, avoids pulling out the corners of the lips and lips, practices gums, teeth close, teeth alignment, lips parallel, while vigorously practicing, corrects the mouth shape and breath. It is recommended that you should not use the immediately before playing, as the exercise will leave you tired. Specification: Material: Stainless steel Color: Silver/Gold Item size: 65 * 18* 10mm / 2.6 * 0.7 * 0.4in Package weight: 38g / 1.4ounce Package Includes: 1 * Mouth Strength Trainer