Ready for more than the beginners rubber ring The experienced C&B men will appreciate our welded metal cock rings. this set comes with 3 black metal cock rings. Good for use to prolong erections, and with a pump. Spartacus cock rings are designed specifically for pleasure by prolonging his erection. Your ring should fit snuggly and be effective but should not cause pain. three sizes come in this set 1.5″ ( 4 cm), 1 3/4″ ( 4.5cm) and 2″ ( 5cm) The recomended usage time is aprox 30 mins. Have fun and play safe