The Wendy Williams Anal Trainer Kit from Doc Johnson is perfect for any level of anal play, from beginning to expert. Who better to learn from than adult star Wendy Williams? Training can be fun! Small butt plug total length 4.5 inches, usable length 3.9 inches, diameter .9 inch. Medium butt plug total length 5.5 inches, usable length 5 inches, diameter 1.6 inches. Large butt plug total length 5.5 inches, usable length 5 inches, diameter 2.5 inches.