The blackĀ Accessory Strap from WMB is a high-quality, 2" belt made of woven elastic material with hook and loop fasteners. It can be used with a WMB Belt Pac (sold separately) to attach a wireless receiver or bodypack transmitter to a 2 to 3" diameter object like a guitar strap, mic stand, music stand, or simiar supports. In addition, the Accessory Strap is machine washable.