The replaceable all in one pad and bumper make corner sanding stutter free and Fluid without damaging the adjacent corner. Much like the sole of a tennis shoe; this patented replaceable pad is made up of 2 layers:
1. A firm wear resistant rubber.
2. Thin pliable layer of foam.
These 2 layers act like a shock absorber on the work surface. A walls surface is not truly flat. The flexible nature of the Trigon180 forms to the wall giving you a perfect finish. Hard sanding pads have a tendency to bridge and streak the soft finish compound.