In Stock. 45 Day Lowest Price - 100% Satisfaction Guarantee. From its unique "frame body" made of removable aluminum support bars to its original one-piece stereo microphone bridge, the new Aria Sinsonido (sin-so-need-oh) is all about innovation. The uniquely designed four steel-string electric bass guitar barely tips the scale at just over four pounds, but its hard maple, 24 fret, one piece neck and body provide a big sound and solid feel. Also available fretless. Includes headphones and free Aria gig bag.