Pearl Abrasives Flexible Grinding Wheels combine the benefits of a depressed grinding wheel, resin fibre disc, and a flap disc into one revolutionary product. Because of their flexability, these wheels provide more more wheel surface on the material being grinded, making for faster grinding efficiency. When you need a smooth finish over contours or in corners these are the perfect wheels for you. These flexible wheels also absorb more vibration, leading to less operator fatigue and downtime.