Metal penis rings
Metal cock rings have a firm, weighty feel that silicone cannot match, and this collection includes steel rings, testicle rings, leather-linked sets and cages. Brands include Kink, Metal Hard and ElectraStim.
Because metal does not stretch, sizing is essential. Rings are listed by diameter, from around 2.6 cm up to 5 cm, so measure carefully and start larger if in doubt. Leather-linked sets such as the Kink 5 Penis Rings combine graduated metal rings with straps, while Metal Hard focuses on testicle and torque rings. ElectraStim Prestige rings are designed for use with electro-stimulation units. Use plenty of lubricant and never wear a ring that feels painful.
See also penis cages, electrostimulation or non-vibrating cock rings.