Three cock rings made of transparent silicone in the set. Due to the tight fit on the penis, they create the optimum condition for the Sexmarathon. The blood is kept in the penis for a strong and long lasting erection. The three rings have a diameter of 4 cm, 4.5 cm and 5 cm. Since they are very stretchy to fit perfectly for any penis size. The rings can also be used to easily Hodenschnürung or testes / penis ring combination.