QA Guitars Quanta Prototype. This is our concept guitar, alder body, limba neck, ebony board, Hosco medium frets, bone nut, Wilkinson tuners, top load bridge, QA Quanta humbucker 13.5k, and weighing in at 5.4 lbs.. The Quanta comes set up with 9-42 guage strings unless otherwise selected. Plain and simple when you need a stage guitar that won't break your back at an affordable price without compromising quality and tone choose the Quanta. Available in Yellow, Red, Blue or Green, 12", 16", or 18" radius.