The ElectraStim Jack Socket is a double award winning compact realistic stroker. It has a curvaceous internal texture, skin like movement and a lifelike feel, but the similarities with other men's sex toys ends there. With a squeezable outer case applying adjustable pressure and bipolar 2mm connection for an estim stimulator, the realistic sleeve comes to life; making your shaft throb and pulsate with pleasure. Relax and tighten your grip to enhance sensation and use plenty of water based lube to intensify your pleasure with every stroke.<br /><br />Although the size difference between the two may seem subtle, the extra space within the sleeve of the XL allows for a more comfortable experience for men with a penis girth to 1.9 inches diameter. The XL sleeve has an indented ribs' texture that produces a subtle suction sensation during use. A tube of conductive gel is also included. XL Orifice minimum diameter 1.45 inches. XL Orifice maximum diameter 1.9 inches. Please note a power box is required, not included. Sold separately.