The exclusive tuning method of the Yamaha DG1590 Bells ensures true pitch, full sound and is consistent with traditional Deagan tone. Computer-controlled tempering process assures uniform hardness of each bar to promote consistent, pure tone. Steel tone bars provide bright, full sound. A single recessed pin bar mounting enhances resonance and increases playing area. 3/8" thick tone bars provide very full tone with superior sustain. Nodal point felt positioning allows maximum bar resonance. Nodal point cord positioning further increases resonance by reducing bar contact to felt. Full size, built-in case with removable lid makes transport easy and serves as sounding board for bells.