The individual adjustable cock ring - you can wear it very tight or slack, always as you prefer.
The ring is striped over the hard penis and the cuff is tightened (tighten by feel - risk of congestion of the veins). You should tighten the cuff careful so that the skin is not pinched.
Features: black rubber round cord made of NBR - elastomer (nitrile), diameter 5 mm, hardness of 70 shores. High strength and elasticity. Food-safe. Very resistant against oils, gasoline and heat. The noble cuff is made of hard-aluminium and treated with an anodized color.