Two panel anal circle probe with 2 pin jacks

Easy to insert and position, and has a large contact surface for multiple sensation capabilities. Hollow in the center making it more flexible. 

It's 77mm (3 inches) in length, 20mm (3/4 inch) at its widest point and 14mm (1/2 inch +) wide where it tapers.  For perspective, one picture is next to a standard #2 size pen.