MR710F. The MR Series represents Cort’s mission to provide the highest quality traditional instruments with superb workmanship and modern features at an unbeatable value. MR710F is a solid sitka spruce top, mahogany back and sides, Ovangkol fingerboard. The classic dreadnaught body has a Venetian cutaway for easy high fret access and is equipped with Fishman Presys electronics to deliver the MR’s natural acoustic sound to an amplification system for both live and recording applications. SOLID SITKA SPRUCE TOP. Spruce provides an ideal balance between strength and flexibility, hence its overwhelming popularity as the wood of choice for tops of acoustic guitars. Spruce’s versatile sonic character makes it ideal for a variety of musical genres and playing styles.