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.