The ZEPHYR® brush is, without question, the finest brush ever developed for use in applying latent print powder to dust for latent fingerprints. The 6 1/2" long brush consists of thousands of fiber bundles, each being composed of over a hundred individual treated-glass filaments. The diameter of the glass filaments is a fraction of the diameter of regular hair fibers used in other fingerprint brushes, resulting in a brush with unsurpassed working qualities. The outstanding characteristics of the ZEPHYR® brush are its long life, capacity to pick up and retain large amounts of fingerprint powder, and the fact that the filament ends become softer with use. Use one ZEPHYR® brush for black powder and one for silver/gray powder.