The flesh tunnel of the Steel Blackline® is 6 mm deep and made of premium processed material. It is externally threaded, the ring is screwed on to the outside thread of the tunnel and ensures a perfect hold.

All tunnels of the Steel Blackline® are sterilisable in spite of their additional PVD coating, and due to their skin friendly material harmless to allergic persons. As a beginner or an experienced person in the matter of gentle stretching, this tunnel is absolutely the right choice.