The Glockenspiel for Elementary Music Education! Sonor NG glockenspiels are the most popular within the range.; Children are fascinated by their bright sound, created by the combination of special alloy metal bars and the arch shaped wooden resonator boxes. Specifications: Alto, chromatic (c2 - b-flat3) Number of bars:;23 Chromatic scale Bars: Steel (red) Bar Width: 20 mm Bar Thickness: 2 mm Resonator Box: made of beech wood and beech plywood Includes 1 pair of SCH 40 mallets