an assembly for damping the movement of a vibrating body includes an energy dissipating material , a vessel , and a seal . the energy dissipating material may include one or more types of loose particles . the loose particles may include similar and / or dissimilar materials or a mixture thereof . the loose particles may at least partially fill the vessel . the vessel may be configured to conform to requirements of an environment of the vibrating body and to retain and / or store the loose particles . the seal may include a molded material , a plate , and / or a flange . in an embodiment , the plate may be at least partially encompassed within the seal , and the seal , plate , and / or flange may be configured to engage the vessel and / or to retain the loose particles within the vessel .