Centaur Archery's Navajo Wool String Silencers are spun by hand which preserves the natural lanolin in the wool. This process makes the naturally waterproof, lightweight, great looking. Unlike heavy hide or synthetic based silencers, Navajo silencers are ultra-lightweight and retain performance, while exceptionally dampening vibration. Due to its rugged, waterproof, lightweight, performance retaining and vibration dampening qualities, Navajo wool is nature’s answer for the perfect string silencer.