"Rock Solid products are designed by a team of cock ring specialists to fit comfortably, be durable, and restrict blood flow resulting in a firmer erection. The Stretcher is made to expand to your likeness, providing comfortable ball support and intense sensations in the bedroom. Made of ultra smooth phthalate-free hybrid silicone, this ring stretches and retains its original shape over time. Rock Solid products are made to last. Available in Clear and Black Material: Premium Phthalate-Free Hybrid Silicone Waterproof: Yes Use with water-based lubricants only"