size: as picture show The Anal Hook - Get hung up on pleasure! Couples who want to combine the visual and sexual pleasure of rope and anal play would find the Anal Hook an ideal item to add to their collection. The Anal Hook features a stainless steel ball that is inserted into the anus. The open ring can then be combined with rope to put a pulling pressure inside the rectum. Put your imagination to work and create whatever intricate rope configurations you desire. The way your partner moves when tied determines how the steel ball will move inside of their anus. There's 3" of insertable length (the ball and a portion of the hook). The anal hook rests against the back, while you use the ring to connect your favorite rope. 4 diameters of ball optional,they are 2cm,2.5cm,3cm,3.8cm.