CPG stands for Contour Profile Gel. It is Mentor’s most cohesive anatomically shaped implant. It was designed after the 410. It seems to be slightly less cohesive. The CPG has similar shapes to the 410, but the dimensions are notably different. It is probably a matter of surgeon and patient preference as to which shape is best. Mentor makes three types of silicone: Cohesive I, Cohesive II, and Cohesive III, with I being the least cohesive and III being the most. The standard silicone implant in the USA is a Cohesive I. The CPG is a cohesive III. There are no Cohesive II implants available in the United States. Mentor refers to the silicone in Cohesive I and Cohesive II implants as "memorygel", and refers to the silicone in the CPG as "memoryshape." Dr. Teitelbaum has experience using the CPG on hundreds of patients as a participant in their pivotal United States clinical trial.