Gruv Gear DUOSTRAP-NEO-BLK DuoStrap Neo,Black The DuoStrap Neo comes in all-black 3.25" wide soft-rolled neoprene, with lengths adjustable from 33" to 44" and an extra-long option that brings the total usable length to 56". Minimize shoulder and back pain by distributing the weight of your instrument.. Unique length adjustments using durable metal hardware. Stylish back cover finished with branded metal rivets. Equally effective for left- and right-handed players. Works great for double-cut basses and guitars, with optional adapter to work with single-cuts.