Heart-2-Heart Cock Ring Double Ringer Nitrile Red. Cock Ring Double Ringer Nitrile is available in two colors: Red and Black. Each sold separately. Dual cock rings are characterized by one cock ring worn behind the testicles and on in front. The two rings are connected by a strip of nitrile. Double Ringer: Nitrile double ringers are a fun and sexy accessory. The larger ring is worn around the entire package while the smaller ring is worn around the bottom of the penis shaft. The leather connecter features turned and sewn edges for maximum comfort and a chrome plated steel snap for versatility. Latex free, nitrile is a preferred material for men with rubber or latex allergies. Double ringer nitrile cock rings feature a 2 inches base ring connected to a 1.5 inches shaft ring Play.