Most of the Duplo models have quarter clips - simply because they are well-proven. The clips facilitate the nailing process because the horseshoe is kept in position by the quarter clips even before all nails are placed. During the regular shoeing period, the quarter clips prevent the horseshoe from twisting or getting out of position.
For therapeutic applications, we have developed the Duplo Wedge which can be combined with every clipped Duplo Horseshoe. There is a wedge for every horseshoe size and shape. You can simply place the wedge on the horseshoe without any further effort - it will be kept in position thanks to the quarter clips.