58cm long Mary Undoer of Knots glass rosary. With this rosary, featuring a centerpiece showing Mary Undoer of Knots and its Mater Dolorosa cross, you will recite your prayers so that Mary will help you untie the knots of your life by solving your problems. With Mater Dolorosa, reflect upon Mary's compassion at the time of the crucifixion of his son Jesus.