The Aneros Helix is aggressively shaped and angled. This model provides immediate pressure and tension on the prostate and surrounding area. Destined to become the new standard because it requires less patience and practice to realize benefits. In terms of dimensions the Helix is larger at the tip 1) 1/16 inch versus 0.9 inch on the MGX 2) More angled to provide a more vigorous massage. However the mid-ridge is slightly smaller 1/16 inch smaller on the Helix. All reports about the Helix have been wonderful! Spefications: 1/16 inch diameter at tip circ. = 3.34 inch 15/16 inch diameter at mid-ridge circ. = 2.94 1 3/4 inch from main body to perineum pressure point. Made in the USA.