Tube Brooms are used on sweepers as a one-piece, one time only replacement instead of the individual wafer setup. The tube broom is constructed on a steel core with a steel channel where the filament (bristles and/or steel wire is crimped then spirally wound throughout the length of the tube. Other names for the tube broom can be main broom, pickup broom, belly broom, etc.
Keystone has engineered their bristles to have more filaments so the customer can have a longer life, a more thorough collection, and to have greater results in their sweeping.
The All Poly filament (bristle) is for General street sweeping where as the Poly/Wire Combo is for a more versatile sweeping.