Heavy-Duty Double-Bar Accessory Straps feature an Acetal Heavy Duty Double-Bar buckle, Box-X sewing for added durability, an angle cut for easy threading, and polypropylene webbing. Again we have taken great care in Performance Matching these units. Polypropylene webbing is a thicker and more coarsely woven material, which makes it inadvisable to use with most other buckles. But the ACW Heavy Duty Double-Bar works flawlessly with polypropylene webbing, allowing us to offer a high quality yet inexpensive accessory strap. These straps come in three lengths (24”, 40”, and 60”) and are available individually or packaged in pairs.