This series has two sides with two end styles (tapered and flat) to fit your needs. Fibers are mechanically clamped into the handle for maximum fiber retention so that no adhesives can leach out and contaminate surfaces being cleaned. Brushes are available with Horse Hair (HH) or Hog Bristle (CK) material. The handle material for the 1010 series is zinc plated steel. Fill Material: Bristle ESD Category: Anti-Static Handle Material: Steel (Zinc-Plated)