X-Stiff Aligners Short Shank Gravel

As the name implies, these aligners are extra stiff. Because the material is stronger and stiffer the aligner can also be refined in shape. The X-stiff Aligners are therefore more compact and finer than the "regular" predecessors. This X-stiff versions are almost as hard as tubing. The perfect and convenient replacement for so. Both versions long shank (short version) and short shank (long version) are available in the X-stiff version. In colors weed, silt and gravel