The support It's for dumbbells vinyl / neoprene, the ones used in aerobic and others collective classes. It has 5 cross bars that act as a separator so we can stack the dumbbells (one over another). In addition, the mancuernero It has a couple of wheels that allow it to move much more easily. The wheels have locks so we can fix the support where we want. Also includes a locking bar to maintain the material safe.