In Stock. 45 Day Lowest Price - 100% Satisfaction Guarantee. The Atlas ABJ250/SM5 Jumbo 5 String Bass features a solid Sitka Spruce top and Mahogany laminate back that take advantage of the bold Breedlove bracing system featuring the JLD Bridge Truss system. Highly resonant and full sounding, this versatile jumbo deep body sounds great acoustically and is ready to plug in and play out!