This set of two (2) UFS Sliders is compatible with our Endless 80 UFS Frames. For hybrid skating explorers wishing to unlock big wheel sole tricks, these Sliders bolt onto the outside of the frame. They may also be mounted on the inside for negative tricks. The design puts the fast and smooth sliding surface right in the sweet spot for common rail and coping sizes, and features lock enhancing geometry that minimizes hang-ups.