Check the listing for details. NS Design NXTa Active Series Electric Viola in Sunburst 4/4. Condition: New. Listed at 1929.00 USD. Based around a 16" viola string scale, key features of this instrument include the Polar™ Pickup System with the new dual mode signal output, patented precision tuning system, sleek, ergonomic design and light weight. The NXTa features a maple body, comfortable Custom Shoulder Rest and an adjustable-height bridge. Most importantly, the NXTa Viola offers artists exceptional amplified and recorded performance quality and extraordinary freedom of expression. The Polar Pickup System is driven directly by the vibration of the strings, enabling it to produce a full spectrum of sound with power and clarity. (By contrast, an acoustic viola's amplified performance is heavily dependent upon the resonant capabilities of the body of the instrument.