In Stock. 45 Day Lowest Price - 100% Satisfaction Guarantee. The AJ250/SM-12 String is a full bodied acoustic electric with a solid Sitka Spruce top and laminate Mahogany back. This highly resonant and full sounding jumbo is ready to plug in and play out. Combining award winning design elements and a balanced tonal signature with high quality manufacturing practices, this guitar is a highly affordable masterpiece.