Firehole Bug Bands, The Firehole Stones Bug Band is a slim specialty bead that is made of fully machined brass. It is an integral part of the Firehole Outdoors Hook-Based Weight Management System. The most common use of the Bug Band may be the immediate addition of a hotspot behind the bead of your fly. Their size, shape, and construction also allow them to be added to any part of the fly, should you require intermediate hotspots, while maintaining the profile of the fly you are tying since varying sizes can be added anywhere in the fly profile. As a brass bead the weight of the bug band is roughly 20% of that of a comparably sized tungsten bead. 36 pack.