Smooth but firm. Brushes made of PVC are stable enough to keep parts on track but soft enough to be gentle on sensitive surfaces. Brush Strips D30 are simply clipped onto a Profile Tube and are available in two designs. Brush Strip D30 T1 has two parallel rows of brushes while Brush Strip D30 T2 has two rows of brushes that project out to the side. Each design is also available in an ESD-safe variant.