The Zephyr ® Brush is the finest brush ever developed for use in fingerprint work. Originally developed in 1956, the 61⁄2" brush consists of thousands of fiber bundles, each composed of more than a hundred individual treated-glass filaments. The diameter of the glass filaments is a fraction of the diameter of hair fibers used in other fingerprint brushes, resulting in a product with unsurpassed working qualities. The Zephyr ® Brush has a long life with the capacity to pick up and retain large amounts of fingerprint powder. Rather than wear out over time, the filament ends actually become softer with each use. Do not be misled by imitators claiming superiority for their product. Since 1956, the Zephyr ® Brush has been the original and continues to be the best fiberglass fingerprint dusting brush available.