The tuning fork set is made of high-quality aluminum alloy with fine workmanship and high precision. The aluminum alloy construction provides durable and reliable performance. The resonance box is made of high-quality wood, which acts as a sound amplifier when the tuning fork is placed on it. The sound produced is natural, balanced, and comfortable to listen to, with a stable and profound resonance effect. This tuning fork is suitable for various applications such as yoga, spa, aromatherapy, meditation, sound therapy, teaching demonstrations, and hearing tests. Frequency: 528 Hz. Color: Silver & Wood Color. Material: Wood + Aluminum Alloy. Size: Resonance Box: Approximately 18 cm in length. Package Contents: 1 x Tuning Fork, 1 x Resonance Box, 1 x Hammer. Additional items not included. Note: Due to lighting and display differences, the color may vary slightly from the image. Measurement tolerance: +/- 1-3 cm.