The Curved Double Coil uses angled windings to increase the depth of penetration of the figure of eight coil design. In addition its bottom surface has been carefully designed to fit well on head surfaces and to be comfortable. Rear adapter allows for a variety of attachment methods. The one shown here is 1" rubber ball compatible with Magstim Co. coil stand. Alternative adapters (such as Manfrotto) are also available and custom designs are possible.