The Sonor Primary Line Glockenspiels represent German made quality at a price for small budgets. The Primary Line Glockenspiels feature aluminum bars for excellent resonance and sustain. All Primary Line Glockenspiels also feature note names and notation symbols printed on the center of each bar for easy pitch recognition plus all birch resonator boxes with 100% glued construction for outstanding resonance and sound clarity. The Sonor Primary Line Glockenspiels are diatonic instruments that include two F# and one Bb bar plus one pair of mallets and are available in soprano (SGP) or alto (AGP) units.