The idea behind this double knobbed dildo is that the middle rings can be used to attach surgical tubing or some other type of elastic cord to perhaps a four post bed or other places to suspend it. Thus, neither partner has to hold it in place during the fun. Be careful to ensure whatever you use is secured well unless you enjoy getting whipped if they break or come loose. I would suggest a 80% or greater infill as you want the loops to be strong.
281 mm long, 48 mm widest insertable diameter