Ever-Flex has developed a new patented system for universal balance control. The Rotational Disk System consists of 18 various sized durable polymer disks that enable you to make immediate cost effective adjustments right in your office. By simply rotating the disk, the correct amount of height adjustment and alignment can be achieved for the perfect amount of balance on the left or right, rearfoot or forefoot, inversion or eversion. Fast, simple, effective, low cost on-the-spot orthotic adjustment.