Non-slip black pads come in three sizes: 9″ (23cm), 12″ (31cm), 15″ (38cm). Pads perfectly cover rotator discs. Great for extra cushioning and comfort. Not for use with detachable rotator discs. 9″ pads can also be used with CoreAlign® rotator discs. 5/8″ thick. Sold individually or in pairs.