Common body shapes for modern acoustic guitars, from smallest to largest: Range – The smallest body shape, also considered a "mini jumbo", is three-quarters the size of a jumbo shaped guitar. A range shape typically has a rounded back which provides projection and volume for the smaller body. The smaller body and scale length make the range guitar an option for players who struggle with larger body guitars. Jumbo – The largest standard guitar body shape found on acoustic guitars. The large body provides more punch and volume, while accenting the “boomy” low end of the guitar.