ROTO cockring is the right fit, right feel grooved cockring for the hardest play. Here's why: 

Extra Strong, Grip Fit style cockring 
Rubbery warm, plus silicone, silicone tpr blend 
Velvet soft surface feels so lush 
Groves hold lube for longer play 
Stack up style ball stretcher too 
Phthalate free with no scent