These stretching rods, designed for use with the Penile Aide device can stretch the top length of the male penis from 5" to 7.5" (an increase of 2.5" over the original Penile Aide rods). These are ideal for men who want to continue the growth that they have experienced with the standard rods. You get a pair of stretching rods for use with your SMP Device. A Penile Aide is sold separately.