Includes: (Set of 4) 1 Each - Tuning Fork C-128 Hz with Red Weights + 1 Each - Tuning Fork C-256 Hz with Pink Weights + 1 Each - Tuning Fork C-512 Hz + 1 Each - Tuning Fork C-1024 Hz for Diagnostics and Examination. Frequency: C-128 Hz, C-256 Hz, C-512, and C-1024 are standard frequencies commonly used in various fields, including music, medicine, and science. This frequency is known for its clear and distinctive sound, making it ideal for tuning instruments, conducting examinations, and performing scientific experiments. Material: Aluminum alloy, a durable and lightweight material that is resistant to corrosion and provides excellent sound transmission. This material ensures that the tuning fork maintains its frequency accuracy over time and is suitable for both indoor and outdoor use. Weights: (C-128 & C-256 Only) Strategically placed on the fork's arms to enhance its resonance and overall sound quality. The color adds a touch of visual appeal and makes the tuning fork easy to identify. Precision: The tuning fork is engineered with exceptional precision to ensure accurate frequency output, even under varying conditions. This precision is achieved through a combination of factors, including the careful selection of materials, precise manufacturing techniques, and rigorous quality control measures. The aluminum alloy used in the fork is carefully chosen for its sound-conducting properties, ensuring that the vibrations produced by the fork are transmitted efficiently and accurately.