Erotic black cock ring set from easytoys men only. With a cock ring, you enjoy your erection longer. Perfect for men who cum quickly. With a penis ring, your erection is delayed, allowing you and your partner to experience more pleasure during sex. The three rings are all a different size so there is always one that fits you perfectly. The rings are made of soft silicone so you enjoy a comfortable fit. Use some water-based lubricant and clean the rings after use with lukewarm water and a toy cleaner. Measurements: Small: inner diameter 3.2 cm and outer diameter 4.2 cm. Medium: inner diameter 3.7 cm and outer diameter 4.7 cm. Large: inner diameter 4.2 cm and outer diameter 5.2 cm.