New Deluxe 2 Tuning Fork Set "A 440 Hz & C 522 Hz" A=440 Hz and C=522 Hz Includes individual Protective Cases The "A" fork measures 4 3/4 inches long x 5/8 inches wide The "C" measures 4 1/2 inches long x 5/8 inches wide. (Please note: The C fork is labeled at 261 Hz, but it is in fact a C-522 Hz Fork!)