3 1/2 octave Standard xylophone with F45-C88 range, 1 3/8" non-graduated bars, two-position resonator slots, folding legs, lower crossbar, angle brace and locking casters on playing side All models feature bars tuned with unique methods developed by Yamaha, A=442Hz tuning and essential accidental resonators. Instruments include one pair of mallets. Includes TAC-YX135DC Drop Cover