The Opal is a high quality accordion with three reed ranks. Due to the medium keyboard (18 mm key width) the instrument has a remarkable range of 37 treble keys and 96 bass buttons – desipte it's little size. This speciality turns the Opal into a favoured accordion among both children and adults. Inclusive hard case and shoulder straps. Color: Blue.SpecsKeys Treble Side: 37Buttons Bass Side: 96Reed Ranks Treble Side: IIIReed Ranks Bass Side: IVRegisters Treble Side: 7Registers Bass Side: 3Range Treble Side: f - f'''Range Bass Side: G - d' #Weight: 8,3 kg / 18,3 lbsDimensions H x D: 412 x 192 mmKey width: Medium - 18 mmInclusive: Case and Straps.